Married: file jointly or separately?
Most calculators just rerun the brackets and tell you separately looks fine. They miss the credits separate filing forfeits. The EITC alone can be thousands. Here's the real cost, attributed by source.
In short
Updated for tax year 2026 · June 2026Filing separately can cost a married couple thousands, and the cost is mostly lost credits, not bracket math. Separate filing forfeits the Earned Income Tax Credit entirely and disqualifies the child and dependent care credit in most cases. A plain bracket comparison shows close to a wash. Run the credits and the real gap appears.
Common questions
Does filing separately ever save a married couple money?⌄
Sometimes, but less often than people expect. Separate filing forfeits the Earned Income Tax Credit and usually the child and dependent care credit, and it halves several phaseout thresholds. For most households with kids, joint comes out ahead once the credits are counted.
Why do bracket calculators say separate filing is fine?⌄
Because they only compare tax brackets, which barely differ between joint and separate. The real difference sits in the credits separate filing loses. A bracket-only view can miss thousands of dollars.
Which credits does filing separately lose?⌄
The Earned Income Tax Credit is forfeited entirely. The child and dependent care credit is disqualified in most cases. The child tax credit and saver's credit survive but at half the income thresholds, so they phase out sooner.
Built and reviewed by the EverydayBudd editorial team. Every figure on this page is reproduced in automated tests against published IRS data before it ships, and the tax figures use 2026 brackets and limits.