Life Events & Your Taxes (2026)

Big life changes reshape your taxes. Each guide explains what changes, gives you a decision table and an action checklist, and pairs with the calculator that runs your numbers.

Just Got Married
Should you file jointly or separately? Here's how marriage changes your taxes for 2026.
Had a New Baby
A new dependent unlocks real tax breaks. Here's the checklist for your 2026 return.
Sold Your Home
Most home sales are tax-free — here's how the $250k / $500k exclusion works.
RSUs Vested
RSUs are taxed like a bonus at vesting — and the default withholding often isn't enough.
Started a Side Hustle
Your first-year 1099 kit: how much to set aside, what you owe, and what you can deduct.
Moved to a New State
Move mid-year and you'll usually file two state returns — here's how to split your income.
Turning 65 or 73
Two big tax birthdays: 65 (bigger deductions, Medicare) and 73 (RMDs begin).

Why life events change your taxes

Your tax return is a snapshot of your year, so anything that changes your income, your household, or what you own can move the number. Marriage and a new child change your filing status and credits. Selling a home or vesting RSUs adds income and capital gains. Starting a side hustle adds self-employment tax and quarterly payments. The common thread: the tax impact is often decided before you file, by choices you make during the year.

That's why each guide focuses on the decision — file jointly or separately, use the FSA or the care credit, sell RSUs at vest or hold, set money aside for quarterly taxes — and pairs it with the calculator that shows the dollars. The quick-reference table below links you to the right one.

Key tax impact at a glance

Life eventKey tax impact
Got marriedNew filing status (MFJ vs MFS); refile both W-4sGuide →
New babyChild Tax Credit up to $2,200 + care credit / FSAGuide →
Sold a home§121 excludes $250k / $500k of gainGuide →
RSUs vestedTaxed as income; 22% withholding often too lowGuide →
Started a side hustleSelf-employment tax + quarterly paymentsGuide →

Do these after any big change

  • Update your Form W-4 so withholding matches your new situation.
  • Reconsider your filing status — marriage, divorce, or a new dependent can change it.
  • Check which credits or exclusions you newly qualify for (or lose).
  • Update beneficiaries and, if you moved, your address with employers and the IRS.
  • If new income has no withholding (side hustle, RSUs), set money aside or pay estimates.

Frequently asked questions

What life events affect my taxes the most?

Marriage and divorce change your filing status; a new child unlocks credits; buying or selling a home affects deductions and capital gains; a new job, RSUs, or a side hustle change your income and withholding. Each of the guides below shows exactly what changes and what to do.

When do I need to update my W-4?

After any major change — marriage, a new child, a raise, a second job, a spouse starting work, or large RSU vesting. Two-income households especially tend to under-withhold with the default settings.

Does a life event change my tax filing status?

Marriage and divorce do — your status is set by your situation on December 31. A new child can qualify you for Head of Household if you're unmarried and support a dependent. Filing status drives your brackets and standard deduction.

Do I owe tax when I sell my house?

Usually not. The Section 121 exclusion shields up to $250,000 of gain ($500,000 married) if it was your main home for 2 of the last 5 years. Only gain above that is taxed at capital-gains rates.

Educational summaries only — every situation is different. Confirm specifics with a qualified tax professional. Full disclaimer.