What Date Is Last Day For File Taxes 2025. If you file on march 16, the change won’t take effect until 2025 (or the following fiscal year). December 31, 2025, is the last day of the tax year and is also the last day to make contributions to your 401 (k) plan or to incur expenses you expect to deduct when you file your 2025 taxes.
On the other hand, you must deposit withheld taxes on a semiweekly basis if you reported more than $50,000 of taxes during the lookback period. While you can file your returns post the deadline, be prepared to pay a penalty and also miss out on some benefits read more.
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