The tax return you filed last year reflected your life as it was last year. If your life has changed significantly — a marriage, a divorce, a new child, a home purchase, a business launch — this year’s return is going to look different. Sometimes very different.
The problem isn’t the change itself. The problem is when the tax implications of that change don’t get factored in until April — when it’s too late to do anything about them.
Here’s how the most common life changes affect your tax situation and what to do about each one.
Getting Married
Marriage changes your filing status and — depending on how your incomes compare — can either reduce your combined tax bill or increase it.
When one spouse earns significantly more than the other, filing jointly usually produces a lower combined tax bill. The income gets spread across brackets in a way that benefits the higher earner.
When both spouses earn similar incomes at higher levels, the opposite can happen. At the highest income levels, two individual filers may pay less in total than the same couple filing jointly, because the top bracket and some surtax thresholds are not double for married couples.
The right move in the year you get married is to run the numbers both ways — jointly and separately — before filing. Your tax professional can model this quickly.
You’ll also need to update your W-4 withholding at work. If neither spouse updates their W-4 after getting married, you may be significantly underwithholding — which shows up as a surprise tax bill the following April.
Getting Divorced
Divorce changes filing status, affects who claims dependents, and creates tax questions around property transfers and retirement account division that require professional guidance.
The year of divorce is particularly complicated because your filing status for the entire year is determined by whether you’re legally married on December 31. If your divorce finalized on December 30, you file as single or head of household for the entire year — even though you were married for most of it.
If you’re going through a divorce and haven’t talked to a tax professional about the tax implications of the settlement terms — who claims the children, how retirement accounts are divided, how property transfers are structured — that conversation needs to happen before the settlement is finalized, not after.
Marriage, a new child, a move, or a new business all change your return. Talk through what your change means before year end.
Having a Child
A new dependent creates new tax credits and may change your filing situation in meaningful ways.
The Child Tax Credit provides up to $2,200 per qualifying child under 17 for 2026. The Child and Dependent Care Credit provides relief for childcare expenses while you work. If you’re self-employed, the credit for employer-provided dependent care benefits may apply.
You’ll need a Social Security number for your child before you can claim any of these. If your child was born late in the year and you haven’t applied for a Social Security number yet, do that immediately — you can’t file with a dependent who doesn’t have one.
Buying a Home
Home ownership creates deductions that renters don’t have — primarily mortgage interest and property taxes — but whether those deductions actually benefit you depends on whether they exceed your standard deduction.
The standard deduction in 2026 is $16,100 for single filers and $32,200 for married filing jointly. If your mortgage interest, property taxes, and other itemized deductions don’t exceed those amounts, you take the standard deduction and the mortgage interest doesn’t help you at all.
For many first-time buyers — especially those with smaller mortgages or lower interest rates — itemizing doesn’t make sense. Confirming this with a tax professional in the year you buy prevents the disappointment of expecting a deduction that doesn’t materialize.
Starting a Business
This is the life change with the most significant tax implications — and the one where getting it wrong in year one creates the most problems.
The moment you start earning self-employment income, you owe self-employment tax — 15.3 percent on net earnings — in addition to federal income tax. Unlike a W-2 employee whose taxes are withheld automatically, you’re responsible for making quarterly estimated payments.
Many first-year business owners don’t realize this until they file their first return and discover they owe not just the tax but an underpayment penalty for not paying it throughout the year. The fix — making quarterly estimated payments — is simple once you know about it. The problem is that most people don’t know about it until they’ve already missed the first year.
If you started a business this year and haven’t made any estimated tax payments, contact a tax professional now. There may still be time to make a Q3 or Q4 payment that reduces your penalty.
The Common Thread
All of these life changes have one thing in common. The tax implications are manageable when you know about them in advance. They’re expensive and stressful when you discover them in April.
The right time to talk to a tax professional about a major life change is before it happens — or as soon as possible after. Not at filing time.
By year end, most of the decisions tied to a life change have already been made. We'd rather work through those changes with clients as they happen.