{"id":6036,"date":"2025-03-01T06:44:00","date_gmt":"2025-03-01T05:44:00","guid":{"rendered":"https:\/\/www.deloris.ch\/?p=6036"},"modified":"2025-07-19T06:41:32","modified_gmt":"2025-07-19T05:41:32","slug":"mistakes-expats-make-on-swiss-tax-returns","status":"publish","type":"post","link":"https:\/\/www.deloris.ch\/en\/insights\/mistakes-expats-make-on-swiss-tax-returns","title":{"rendered":"Top Mistakes Expats Make on a Swiss Tax Return (And How to Avoid Them)"},"content":{"rendered":"\n<p><strong><strong>As an expat in Switzerland, navigating the complex Swiss tax system can be challenging. Many internationals make costly errors on their tax returns, often due to unfamiliarity with Swiss tax laws and reporting requirements.<\/strong><\/strong><\/p>\n\n\n\n<p>Filing taxes in Switzerland as an expat comes with unique complexities. From declaring worldwide income and assets to understanding canton-specific rules, there are many potential pitfalls. Being aware of common mistakes can help you file an accurate return and avoid penalties or unexpected tax bills.<\/p>\n\n\n\n<p>This guide covers the most common tax mistakes made by expats and foreign residents in Switzerland, along with tips to avoid them.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\" style=\"font-size:24px\">Top Swiss Tax Return Mistakes to Avoid<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\" style=\"font-size:20px\"><strong>Failing to Declare Foreign Income and Assets<\/strong><\/h3>\n\n\n\n<p>One of the biggest mistakes expats make is not reporting income and assets from outside Switzerland. The Swiss tax system requires residents to declare their worldwide income and wealth, including:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\">\n<li style=\"line-height:1.6\">Foreign bank accounts and investments<\/li>\n\n\n\n<li style=\"line-height:1.6\">Overseas properties<\/li>\n\n\n\n<li style=\"line-height:1.6\">Foreign pensions and retirement accounts (in particular ROTH accounts)<\/li>\n\n\n\n<li style=\"line-height:1.6\">Income from work performed abroad<\/li>\n\n\n\n<li style=\"line-height:1.6\">Income and wealth from spouse when they live in another country<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\"><\/div>\n<\/div>\n\n\n\n<p><strong>How to avoid it:<\/strong> Carefully review all your foreign income sources and assets. Report everything, even if it&#8217;s taxed in another country. Switzerland has tax treaties with many nations to avoid double taxation. Your tax consultant makes sure that no double taxation occurs.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\" style=\"font-size:20px\"><strong>Incorrectly Reporting Rental Income<\/strong><\/h3>\n\n\n\n<p>Expats who rent out property, whether in Switzerland or abroad, often make errors in reporting rental income. Common mistakes include:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\">\n<li style=\"line-height:1.6\">Not declaring income from short-term rentals (e.g. Airbnb)<\/li>\n\n\n\n<li style=\"line-height:1.6\">Failing to report rental income from overseas properties<\/li>\n\n\n\n<li style=\"line-height:1.6\">Incorrectly calculating deductible expenses<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\"><\/div>\n<\/div>\n\n\n\n<p><strong>How to avoid it:<\/strong> Keep detailed records of all rental income and expenses. Be sure to declare income from any short-term rentals or overseas properties. Consult a tax professional to ensure you&#8217;re claiming all eligible deductions.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\" style=\"font-size:20px\"><strong>Misunderstanding Residency Rules<\/strong><\/h3>\n\n\n\n<p>Switzerland&#8217;s residency rules for tax purposes can be confusing for newcomers. Mistakes include:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\">\n<li style=\"line-height:1.6\">Assuming you&#8217;re not taxable if you&#8217;re in Switzerland for less than 183 days<\/li>\n\n\n\n<li style=\"line-height:1.6\">Not realizing you may be considered a tax resident even without a permanent residence permit<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>How to avoid it:<\/strong> Familiarize yourself with Swiss residency rules. Generally, if you stay in Switzerland for more than 90 days (or 30 days if working), you may be considered a tax resident. Seek professional advice if you&#8217;re unsure of your status.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\" style=\"font-size:20px\"><strong>Overlooking Deductions and Credits<\/strong><\/h3>\n\n\n\n<p>Many expats miss out on valuable deductions and credits, such as:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\">\n<li style=\"line-height:1.6\">Contributions to Swiss pension plans (Pillar 3a)<\/li>\n\n\n\n<li style=\"line-height:1.6\">Professional expenses<\/li>\n\n\n\n<li style=\"line-height:1.6\">Charitable donations<\/li>\n\n\n\n<li style=\"line-height:1.6\">Education expenses<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\"><\/div>\n<\/div>\n\n\n\n<p><strong>How to avoid it:<\/strong> Research available deductions or consult a tax advisor. Keep receipts and documentation for all potentially deductible expenses throughout the year.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\" style=\"font-size:20px\"><strong>Errors in Reporting Foreign Financial Accounts<\/strong><\/h3>\n\n\n\n<p>Expats often make mistakes when reporting foreign bank accounts, investments, and other financial assets. Common errors include:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\">\n<li style=\"line-height:1.6\">Not reporting accounts below a certain threshold<\/li>\n\n\n\n<li style=\"line-height:1.6\">Failing to convert foreign currency balances to Swiss francs<\/li>\n\n\n\n<li style=\"line-height:1.6\">Not reporting foreign dividends and capital gains<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>How to avoid it:<\/strong> Report all foreign financial accounts, regardless of balance. Report as well foreign taxed income (as dividends). Your tax advisor ensures that no double taxation occurs. In fact, the foreign tax can be reclaimed to a certain extent. Use the federal exchange rates for currency conversion.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center\" style=\"font-size:20px\"><strong>Mishandling U.S. Tax Obligations<\/strong><\/h3>\n\n\n\n<p>American expats face additional complexities due to U.S. citizenship-based taxation. Mistakes include:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<ul class=\"wp-block-list\">\n<li style=\"line-height:1.6\">Not filing U.S. tax returns or FBARs<\/li>\n\n\n\n<li style=\"line-height:1.6\">Failing to report Swiss financial accounts to the IRS<\/li>\n\n\n\n<li style=\"line-height:1.6\">Not claiming Foreign Earned Income Exclusion or Foreign Tax Credit<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n\n<p><strong>How to avoid it:<\/strong> Stay compliant with both U.S. and Swiss tax obligations. Consider working with a Deloris tax professional experienced with both systems.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.deloris.ch\/en\/contact\">Contact us today<\/a><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center has-ast-global-color-2-color has-text-color\" style=\"font-size:24px\">Tips for Filing Paper Tax Returns<\/h2>\n\n\n\n<p>While many cantons now offer online filings, some expats may need to submit paper returns. If filing by paper, note the following:<\/p>\n\n\n\n<div class=\"wp-block-uagb-icon-list uagb-block-796b2280\"><div class=\"uagb-icon-list__wrap\">\n<div class=\"wp-block-uagb-icon-list-child uagb-block-df8405bc\"><span class=\"uagb-icon-list__source-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M256 0C114.6 0 0 114.6 0 256c0 141.4 114.6 256 256 256s256-114.6 256-256C512 114.6 397.4 0 256 0zM406.6 278.6l-103.1 103.1c-12.5 12.5-32.75 12.5-45.25 0s-12.5-32.75 0-45.25L306.8 288H128C110.3 288 96 273.7 96 256s14.31-32 32-32h178.8l-49.38-49.38c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0l103.1 103.1C414.6 241.3 416 251.1 416 256C416 260.9 414.6 270.7 406.6 278.6z\"><\/path><\/svg><\/span><span class=\"uagb-icon-list__label\">Use black or blue ink only &#8211; never red<\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-icon-list-child uagb-block-cb3675a7\"><span class=\"uagb-icon-list__source-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M256 0C114.6 0 0 114.6 0 256c0 141.4 114.6 256 256 256s256-114.6 256-256C512 114.6 397.4 0 256 0zM406.6 278.6l-103.1 103.1c-12.5 12.5-32.75 12.5-45.25 0s-12.5-32.75 0-45.25L306.8 288H128C110.3 288 96 273.7 96 256s14.31-32 32-32h178.8l-49.38-49.38c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0l103.1 103.1C414.6 241.3 416 251.1 416 256C416 260.9 414.6 270.7 406.6 278.6z\"><\/path><\/svg><\/span><span class=\"uagb-icon-list__label\">Write legibly in block letters<\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-icon-list-child uagb-block-1ec5713a\"><span class=\"uagb-icon-list__source-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M256 0C114.6 0 0 114.6 0 256c0 141.4 114.6 256 256 256s256-114.6 256-256C512 114.6 397.4 0 256 0zM406.6 278.6l-103.1 103.1c-12.5 12.5-32.75 12.5-45.25 0s-12.5-32.75 0-45.25L306.8 288H128C110.3 288 96 273.7 96 256s14.31-32 32-32h178.8l-49.38-49.38c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0l103.1 103.1C414.6 241.3 416 251.1 416 256C416 260.9 414.6 270.7 406.6 278.6z\"><\/path><\/svg><\/span><span class=\"uagb-icon-list__label\">Don&#8217;t use staples or paper clips<\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-icon-list-child uagb-block-8bde5844\"><span class=\"uagb-icon-list__source-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M256 0C114.6 0 0 114.6 0 256c0 141.4 114.6 256 256 256s256-114.6 256-256C512 114.6 397.4 0 256 0zM406.6 278.6l-103.1 103.1c-12.5 12.5-32.75 12.5-45.25 0s-12.5-32.75 0-45.25L306.8 288H128C110.3 288 96 273.7 96 256s14.31-32 32-32h178.8l-49.38-49.38c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0l103.1 103.1C414.6 241.3 416 251.1 416 256C416 260.9 414.6 270.7 406.6 278.6z\"><\/path><\/svg><\/span><span class=\"uagb-icon-list__label\">Print single-sided on A4 paper<\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-icon-list-child uagb-block-3bf2c64b\"><span class=\"uagb-icon-list__source-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M256 0C114.6 0 0 114.6 0 256c0 141.4 114.6 256 256 256s256-114.6 256-256C512 114.6 397.4 0 256 0zM406.6 278.6l-103.1 103.1c-12.5 12.5-32.75 12.5-45.25 0s-12.5-32.75 0-45.25L306.8 288H128C110.3 288 96 273.7 96 256s14.31-32 32-32h178.8l-49.38-49.38c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0l103.1 103.1C414.6 241.3 416 251.1 416 256C416 260.9 414.6 270.7 406.6 278.6z\"><\/path><\/svg><\/span><span class=\"uagb-icon-list__label\">Include all required forms and supporting documents<\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-icon-list-child uagb-block-26408c8a\"><span class=\"uagb-icon-list__source-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M256 0C114.6 0 0 114.6 0 256c0 141.4 114.6 256 256 256s256-114.6 256-256C512 114.6 397.4 0 256 0zM406.6 278.6l-103.1 103.1c-12.5 12.5-32.75 12.5-45.25 0s-12.5-32.75 0-45.25L306.8 288H128C110.3 288 96 273.7 96 256s14.31-32 32-32h178.8l-49.38-49.38c-12.5-12.5-12.5-32.75 0-45.25s32.75-12.5 45.25 0l103.1 103.1C414.6 241.3 416 251.1 416 256C416 260.9 414.6 270.7 406.6 278.6z\"><\/path><\/svg><\/span><span class=\"uagb-icon-list__label\">Sign and date the return<\/span><\/div>\n<\/div><\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\" style=\"font-size:24px\"><strong>Don&#8217;t Fall into These Tax Traps<\/strong><\/h2>\n\n\n\n<p>Navigating the Swiss tax system as an expat is fraught with potential pitfalls. By avoiding the common mistakes we&#8217;ve outlined, you&#8217;ll be better equipped to stay compliant and optimize your tax situation.<\/p>\n\n\n\n<p>The complexities of Swiss taxation, especially for internationals, often require expert guidance. Our experienced team is here to help, ensure compliance, and potentially save you money.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.deloris.ch\/en\/contact\">Contact us today<\/a><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center has-ast-global-color-2-color has-text-color\" style=\"font-size:24px\">Frequently Asked Questions<\/h2>\n\n\n<div class=\"wp-block-uagb-faq uagb-faq__outer-wrap uagb-block-e65d9f61 uagb-faq-icon-row uagb-faq-layout-accordion uagb-faq-expand-first-true uagb-faq-inactive-other-true uagb-faq__wrap uagb-buttons-layout-wrap uagb-faq-equal-height     \" data-faqtoggle=\"true\" role=\"tablist\"><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-f5be64f6 \" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\"><strong><strong><strong>What happens if I make a mistake on my Swiss tax return?<\/strong><\/strong><\/strong><\/span><\/div><div class=\"uagb-faq-content\"><p>If you realize you&#8217;ve made an error, it always depends on the materiality of error and the assessment status of the particular tax year. We would recommend discussing it with your Deloris AG tax advisor before you contact the tax authorities.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-ea739b7c \" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\"><strong><strong><strong>Can I be penalized for honest mistakes on my tax return?<\/strong><\/strong><\/strong><\/span><\/div><div class=\"uagb-faq-content\"><p>Generally, honest mistakes made in good faith are not penalized. However, repeated errors or failure to report significant income or assets could result in penalties. When in doubt, seek professional advice first before disclosing everything.<\/p><\/div><\/div><div class=\"wp-block-uagb-faq-child uagb-faq-child__outer-wrap uagb-faq-item uagb-block-c7c392fe \" role=\"tab\" tabindex=\"0\"><div class=\"uagb-faq-questions-button uagb-faq-questions\">\t\t\t<span class=\"uagb-icon uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox= \"0 0 448 512\"><path d=\"M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<span class=\"uagb-icon-active uagb-faq-icon-wrap\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox= \"0 0 448 512\"><path d=\"M400 288h-352c-17.69 0-32-14.32-32-32.01s14.31-31.99 32-31.99h352c17.69 0 32 14.3 32 31.99S417.7 288 400 288z\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/span>\n\t\t\t<span class=\"uagb-question\"><strong><strong><strong>What should I do if I forgot to declare income or assets in previous years?<\/strong><\/strong><\/strong><\/span><\/div><div class=\"uagb-faq-content\"><p>Switzerland offers a voluntary disclosure program that allows taxpayers to report previously undeclared income or assets without facing penalties. However, this must be done before the tax authorities discover the omission.<br><br><a href=\"https:\/\/www.deloris.ch\/en\/contact\">Contact us <\/a>to seek professional advice.<\/p><\/div><\/div><\/div>\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-uagb-marketing-button uagb-marketing-btn__align-center uagb-marketing-btn__align-text-center uagb-marketing-btn__icon-after uagb-block-8be69a0f wp-block-button\"><a href=\"https:\/\/www.deloris.ch\/wp-content\/uploads\/2025\/02\/Deloris-AG-Tax-Filing-Deadlines-by-Canton.pdf\" class=\"uagb-marketing-btn__link wp-block-button__link\" target=\"_blank\" rel=\"noopener noreferrer\"><span class=\"uagb-marketing-btn__title\">DOWNLOAD OUR FREE GUIDE<\/span><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M384 320c-17.67 0-32 14.33-32 32v96H64V160h96c17.67 0 32-14.32 32-32s-14.33-32-32-32L64 96c-35.35 0-64 28.65-64 64V448c0 35.34 28.65 64 64 64h288c35.35 0 64-28.66 64-64v-96C416 334.3 401.7 320 384 320zM488 0H352c-12.94 0-24.62 7.797-29.56 19.75c-4.969 11.97-2.219 25.72 6.938 34.88L370.8 96L169.4 297.4c-12.5 12.5-12.5 32.75 0 45.25C175.6 348.9 183.8 352 192 352s16.38-3.125 22.62-9.375L416 141.3l41.38 41.38c9.156 9.141 22.88 11.84 34.88 6.938C504.2 184.6 512 172.9 512 160V24C512 10.74 501.3 0 488 0z\"><\/path><\/svg><p class=\"uagb-marketing-btn__prefix\">Tax Filing Deadlines &#8211; From Aargau to Zurich \ud83c\udde8\ud83c\udded<\/p><\/a><\/div>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"\/>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-ast-global-color-2-color has-text-color\" style=\"font-size:16px\">About the Author<\/h4>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to avoid costly errors and Swiss tax return mistakes as an expat.<\/p>\n","protected":false},"author":5,"featured_media":6050,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[17],"tags":[25],"class_list":["post-6036","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-insights","tag-taxes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Top Swiss Tax Return Mistakes Expats Make<\/title>\n<meta name=\"description\" content=\"Learn how to avoid costly errors and Swiss tax return mistakes as an expat. 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