Hiding from tax authorities is a bad strategy. It has always been a bad strategy. You’re not Jordan Belfort and it’s not the 90s. In 2026 it's a catastrophically bad strategy.

Every month we get a call that starts something like: "I moved to X country in 2019. I didn't really tell the tax office in my home country and I haven’t been filing tax returns. I kept my old bank account and address. Now I've had a letter and I'm not sure what to do."

The letter is CRS-triggered. If you’re from an OECD member country, you need to know what CRS is. It's the tax authority catching up. And once it does, the options range from expensive to disastrous.

Here's how the catch-up actually happens, and why quiet is not a plan.

How Your Home Tax Authority Finds Out

Financial account reporting under the Common Reporting Standard (if you’re American, the US equivalent is FATCA). Your Colombian (or Panamanian/Mexican/Thai/Indonesian/Maltese/etc.) bank asks where you're tax-resident. You say Colombia. The bank legally has to report the account to the local tax authority, which automatically, digitally, and silentlyshares the information with your home country's tax authority under the CRS network. They receive an automatic report every year of your total income into the account, and details of major transactions, plus other financial data painting the whole picture for the authorities back home. On top of that, they can also find out:

• Immigration data. Canadian, Australian, US, British, New Zealand, and EU tax authorities routinely obtain travel and residency data from popular destinations through inter-agency sharing.

• Real estate transactions. If you buy property abroad and it appears on your foreign asset return, it's cross-referenced. If it doesn't appear on your foreign asset return, that's a separate problem.

• Correspondence patterns. If your home-country address stops receiving mail response, if your driver's licence expires and doesn't renew, if your health card lapses, the pattern is visible.

• Voluntary information from third parties. Divorcing spouses. Business partners. Former employees. Family disputes generate a surprising amount of tax authority information.

What Happens When They Catch Up

• Reassessment notices for all the years you should have filed as either resident or non-resident but didn't do properly.

• Full tax owed on income they identify, calculated as if you'd stayed resident (which is usually the worst-case treatment).

• Penalties for late or non-filing (typically 5% of the tax owing plus 1% per month, capped but building fast).

• Interest on the tax owing from the original due date at the tax authority's prescribed rates.

• Gross-negligence penalties (50% of the additional tax owing) if the pattern suggests deliberate rather than accidental non-compliance.

• Potential criminal prosecution in extreme cases, or in cases where you owe back-taxes that you can’t afford to pay.

The Cost of Fixing It Late vs Fixing It Early

Fixing it early — before the letter arrives — is called voluntary disclosure. Here’s how it benefits you in different jurisdictions:

• Canada's Voluntary Disclosures Program (VDP): properly-made disclosure typically eliminates penalties and reduces interest. Tax owing is still due, but the total bill is usually a fraction of the caught version.

• Australia's voluntary disclosure: similar mechanics. Penalty relief for pre-audit disclosure.

• US streamlined and offshore voluntary disclosure programs: complex but generally much cheaper than a full audit outcome.

• UK's Contractual Disclosure Facility and Worldwide Disclosure Facility: similar principles.

Fixing it after the letter arrives, or worse after an audit starts, is much more expensive. The tax authority already knows most of what happened; the disclosure is now defensive.

Fixing it after criminal referral is a legal defence matter, not a tax planning matter.

The One-Year Grace Period Doesn't Exist

Some expats think "if I stay away for a year they can't touch me." Not true. Statutes of limitations are typically longer than that (e.g. Canada: three or four years for reassessment, indefinite for gross-negligence or fraud). Statute clocks often don't start until the return is filed — and if you never filed, the clock never starts.

There is no "get out of jail free" length of time.

What To Do Instead

• If you moved and didn't file properly: get voluntary disclosure advice now, before a letter arrives.

• If you moved and haven't been detected yet: same answer. The local tax authority reporting to your home country is annual and automatic.

• If you're planning to move and thinking about staying quiet: don't. The compliance cost of doing it properly is a small fraction of the eventual catch-up cost.

• If you've already had a letter: get professional help immediately. Don't try to reply on your own; every word matters. They can, and routinely do, take all of your money and prosecute you. Remember, the FBI never caught Al Capone, the IRS got him for undeclared income! What’s changed since the 1920s is now there’s infinitely more technology, surveillance, personnel and resources at the disposal of Western tax authorities.

We have personally seen a Swedish citizen get prosecuted by Australian tax authorities in an Italian court, and then get extradited to face criminal prosecution, for back taxes 15 years after he physically left Australia because he decided to just ‘ignore the letter’ from the ATO. It’s real, and it happens to normal people, not just criminal masterminds.

The Deeper Point

Cross-border living done right is not expensive to comply with. The exit tax you owe you were going to owe anyway. The annual returns cost hundreds of dollars, not thousands. The Panamanian structure fees are trivial against the tax it legitimately manages.

The catastrophic costs come from trying to hide, being caught, and paying decades of back tax plus penalties plus interest plus legal fees.

Nobody who's been through the "caught" version thinks it was worth trying.