Married filing separately has always been the expensive filing status. The 2025 tax law made it more so, and the change is unusually blunt: three of the four new deductions are simply unavailable to separate filers, and the fourth is cut in half.

If you file separately out of habit, or because a preparer set it up that way years ago, this is worth revisiting. If you file separately for a specific reason, that reason may still be good — but you should know what it now costs.

What you lose outright

The tips deduction, the overtime deduction and the senior deduction all carry the same condition. The IRS states it directly for the senior provision: eligible taxpayers must "file jointly if married, to claim the deduction." The same requirement applies to the other two.

There is no reduced version for separate filers and no proration. The deduction is zero.

A tipped worker with a spouse — same income, two filing statuses

  1. Line 1Qualified tips reported$14,000
  2. Line 2Tips deduction if filing jointly$14,000
  3. Line 3Tips deduction if filing separately$0
  4. Line 4Income tax difference at a 12% rate$1,680

What gets halved

The SALT deduction survives separate filing but at half strength. The statute sets the cap for a separate return at half the amount available to other filers, which for 2026 means half of $40,400.

A couple who itemize and pay substantial state income and property taxes are the households most likely to be near the cap in the first place, so this is not a small detail for them. Two separate returns each capped at half is not equivalent to one joint return at the full amount once you account for everything else that changes.

Note also that the 2026 SALT figures are statutory amounts. Our SALT guide explains where they come from and flags what the IRS has and has not yet published for the 2026 tax year.

The other costs, which are not new

Separate filing has long carried disadvantages that predate this law and still apply. In broad terms, separate filers face restrictions or reduced amounts on a range of tax benefits, and if one spouse itemizes, the other generally must itemize too — which can leave the second spouse worse off than the standard deduction would have.

The 2025 deductions are stacked on top of that existing gap rather than replacing it. That is why the arithmetic has moved further against separate filing than in previous years.

When separate filing still makes sense

There are real reasons, and none of them are about minimising this year's federal tax bill. If one of these applies to you, the lost deductions are a cost of something you are buying deliberately.

  • Liability separation.A joint return generally makes both spouses responsible for the whole tax. If you have reason to doubt the accuracy or completeness of your spouse's reporting, separate filing limits your exposure.
  • A separation or divorce in progress. Filing jointly requires cooperation, shared information and agreement about the refund. Sometimes that is not available.
  • Income-driven student loan repayment.Some repayment plans compute the payment from the borrower's income as shown on their return. Separate filing can reduce the payment by more than it costs in tax — but this depends on the plan and the numbers, and it has to be calculated, not assumed.
  • Thresholds measured against one spouse's income. A deduction limited by a percentage of AGI can be easier to reach against one spouse's smaller AGI than against a combined one.

In every one of these cases the right move is to compute both ways. "Separate filing is usually worse" is a good default and a bad substitute for arithmetic.

Quick answers

  • Can we file separately and each claim our own tips deduction? No. Separate filing disqualifies both of you from the tips, overtime and senior deductions regardless of who earned the income.
  • Only one of us is over 65. Does that change anything? Not for this rule. The joint-filing requirement applies to the deduction, not to which spouse qualifies. Filing jointly, a couple with one qualifying spouse still claims one person's amount.
  • What if we already filed separately? A separate return can generally be changed to a joint one by amending, and the reverse is much more restricted. See our guide to amending — and check the current deadline rules before relying on this.
  • Is head of household an option? Only if you meet its conditions, which require living apart from your spouse for the required period and maintaining a home for a qualifying person. It is not a choice you make; it is a status you either qualify for or do not.

To see the size of what is at stake for your household, run the Total Savings Estimator with your combined figures. The joint result is what separate filing gives up on the federal deductions covered here — set against whatever you are gaining elsewhere.