Marriage, divorce, a death in the family, a new job, a business launch, or an unexpected windfall can each shift your tax picture considerably. The problem is that most people don’t realize the tax implications until they’re sitting across from their preparer the following spring, by which point several planning windows have already closed.
Here’s a guide to the life changes and taxes that warrant a proactive review and what each one actually changes about your situation.
Tax implications of marriage affects everything from your tax brackets to your eligibility for certain deductions and credits. For most couples, filing jointly is more favorable, but for high-earning dual-income households, combined income can push both spouses into a higher bracket than either faced individually. This is sometimes called the marriage penalty, and it’s worth understanding before you assume joint filing is always the right call.
Beyond filing status, marriage triggers a few immediate action items that are easy to overlook. Both spouses should update their W-4s with their employers to reflect the new household income picture, otherwise you may end up significantly under-withheld by year-end. Beneficiary designations on retirement accounts, life insurance, and payable-on-death accounts should also be reviewed and updated, since these don’t automatically change when you marry.
If either spouse owns a home, a business, or has significant assets coming into the marriage, it’s also worth reviewing how those assets are titled and whether any pre-marriage planning conversations are worth having with a tax advisor.
Divorce and taxes are complex. A few of the most consequential areas:
An inheritance can feel straightforward—you receive assets, and most of the time you don’t owe federal income tax on them as a beneficiary. But what you do with those assets, and how you structure the receipt of them, has real tax implications worth understanding.
Inherited property, stocks, real estate, a business interest, generally receives a stepped-up cost basis to the fair market value at the date of the original owner’s death. That means if you inherit stock that was purchased for $10,000 and is now worth $80,000, your basis is $80,000. If you sell it immediately, you owe no capital gains tax on that $70,000 of appreciation. This is one of the most valuable tax provisions in the code for heirs, and it’s worth acting on thoughtfully.
Inherited IRAs are more complicated. Under the SECURE Act and subsequent IRS regulations that took full effect in 2025, most non-spouse beneficiaries are required to fully distribute an inherited IRA within 10 years of the original owner’s death. If the original owner had already begun taking required minimum distributions, beneficiaries must also take annual RMDs throughout that 10-year period. Depending on your income level, pulling large distributions in a single year can push you into a higher bracket. Spreading distributions strategically across the decade, particularly in lower-income years, is one of the most important planning opportunities available to inherited IRA beneficiaries.
South Carolina doesn’t impose a state inheritance or estate tax, but if the estate is large enough to trigger the federal estate tax threshold (currently over $13 million per individual), the settlement of that estate can have implications for what you ultimately receive.
Don’t wait until tax season to find out what it means for your situation. A proactive tax review now can protect you from surprises later.
A significant income increase, whether from a new job, a bonus, stock compensation, or an unexpected windfall, can create a withholding gap that catches people off guard. If your employer isn’t withholding enough to cover your new income level, you may owe a lump sum at filing and potentially face an underpayment penalty on top of it.
The fix is usually updating your W-4 or, if you have self-employment income or investment income outside of payroll, making estimated quarterly tax payments. The IRS safe harbor rule requires you to pay either 100% of last year’s tax liability or 90% of this year’s, whichever is smaller, to avoid a penalty. For high earners with an AGI over $150,000, that threshold rises to 110% of last year’s liability.
If the windfall comes from selling a business, exercising stock options, or receiving a large settlement, the tax planning complexity increases considerably. These are situations where the timing of recognition, the type of income, and your overall income picture for the year all interact in ways that reward advance planning.
Moving from a W-2 job to self-employment is one of the most common triggers for an unexpected tax bill. As an employee, your employer covers half of your Social Security and Medicare taxes. As a self-employed person, you’re responsible for the full self-employment tax, 15.3% on the first $176,100 of net earnings in 2025, plus 2.9% Medicare tax on everything above that.
You’re also responsible for paying taxes quarterly rather than having them withheld automatically. Missing those deadlines results in an underpayment penalty, even if you pay the full amount when you file in April.
The launch of a new business also opens up a set of deductions that weren’t previously available: business expenses, home office deductions, vehicle use, retirement plan contributions as both employer and employee, and potentially the QBI deduction on pass-through income. Getting a tax review at the start of self-employment, not after the first year, is one of the highest-return planning decisions a new business owner can make.
The death of a spouse triggers one of the most significant and underappreciated tax cliff events in the tax code. In the year of your spouse’s death, you can generally still file as married filing jointly. For the two following years, if you have a dependent child, you may qualify for the Qualifying Surviving Spouse status, which preserves the MFJ tax brackets.
After that window closes, you’ll file as a single filer, which means narrower tax brackets, a smaller standard deduction, and a lower threshold for Medicare premium surcharges (IRMAA). A surviving spouse who had joint income in the $250,000–$350,000 range may find themselves in a meaningfully higher effective rate as a single filer. Planning for this transition, particularly around Roth conversions, RMD timing, and Social Security strategy, can make a real difference in long-term tax burden.
Beneficiary designations on retirement accounts, life insurance, and investment accounts should be updated promptly. Inherited retirement accounts from a spouse have more favorable rules than inherited accounts from a non-spouse: a surviving spouse can roll an inherited IRA directly into their own IRA, restart RMDs based on their own age, and treat the account as their own going forward.
Every major life event on this list has one thing in common: the most valuable planning happens before or shortly after the event, not at tax time the following year. Updating your withholding, understanding basis before you sell inherited assets, structuring a divorce settlement with tax efficiency in mind, or setting up quarterly estimated payments when you go self-employed—these are decisions that are much easier to make proactively.
If you’ve recently experienced any of the changes above, or you know one is coming, a personal tax review is worth scheduling sooner rather than later. Manley works with individuals throughout South Carolina and the Southeast to help them navigate the tax side of life’s biggest transitions. Reach out to schedule a free consultation.
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