Taxes When You Remarry Later in Life

Getting married later in life — often a second or third marriage — brings distinct tax considerations that don't typically apply when younger couples marry. Income levels, retirement accounts, Social Security benefits, and estate planning are all areas where a later-life marriage requires thoughtful analysis rather than just defaulting to the same choices a younger couple might make.

The first question is the same as any marriage: filing jointly or separately? For later-life couples, the income disparity between spouses can be significant — one may be retired and drawing Social Security and pension income, while the other is still working. Married filing jointly pools both incomes, which can cause a larger share of Social Security benefits to become taxable. The "marriage tax" on Social Security is real: up to 85% of benefits are taxable based on "combined income" (AGI plus non-taxable interest plus half of Social Security), and a higher-earning new spouse's income can push the combined income well above the thresholds. Running the numbers both ways before filing the first joint return is particularly important in this situation.

Remarriage can affect survivor benefits from a prior marriage. If you receive a widow's or widower's Social Security benefit from a deceased former spouse, remarrying before age 60 (50 if disabled) generally ends that entitlement — though remarrying after 60 does not affect it. Pension survivor benefits from a former spouse's pension may also be affected depending on the plan terms and whether there's a qualified domestic relations order in place. Review any agreements from prior divorces carefully before remarrying, as some divorce decrees include clauses that affect financial arrangements upon remarriage.

Later-life marriages often involve spouses with substantial assets from prior relationships, children from prior marriages, and different estate planning goals. A new spouse has automatic legal rights to a share of your estate under state law, which can conflict with estate plans designed to benefit children from a prior marriage. Prenuptial agreements are common in this situation for good reason — they can define how assets are divided both during the marriage and at death, protecting the inheritance intentions for both parties' children. If you have a revocable trust or will leaving assets to children from a prior marriage, it almost certainly needs to be updated to reflect the new marriage and explicitly address the new spouse's rights.

Retirement account beneficiary designations require immediate attention after any marriage. Whoever is named on the beneficiary designation form receives the account at death — regardless of what your will says. If you want your new spouse to be the beneficiary of your IRA or 401(k), you must update the beneficiary designation form with the financial institution. 401(k) plans generally require spousal consent to name someone other than the spouse as beneficiary. An inherited IRA from your new spouse gives you more options than an inherited IRA from a non-spouse, including the ability to treat it as your own and delay distributions — one more reason to make sure beneficiary designations are properly updated to reflect your intentions in the new marriage.