Every change to federal and state tax law and administration that TaxMath has recorded: enacted laws, new rates and thresholds, deadlines and relief, agency guidance, court rulings, ballot measures and bills with real backing. Each entry is checked against the official document it links to, and where a change moves a state against others, it says how. To see what the differences mean for one return, use the state comparison.
13 changes in 5 jurisdictions · updated October 23, 2026
Employers can now correct qualified plan, 403(b), SEP and SIMPLE IRA mistakes under the updated EPCRS (Rev. Proc. 2026-34) from October 22, 2026. From May 1, 2027, a new IRA Compliance Resolution System lets IRA owners and custodians fix errors caused by a service provider and lets people ask the IRS to waive a missed 60-day rollover deadline without a private letter ruling.
Since October 1, 2026, Treasury opens a Trump Account for each eligible child on its own; a parent claims it in the Trump Accounts app instead of filing Form 4547 to open it. The one-time $1,000 government deposit for U.S.-citizen children born from 2025 through 2028 still needs a Form 4547 election, which can be made in the app, on the Trump Accounts website or in an IRS online account.
Final Treasury regulations let the IRS accept credit and debit card payments itself rather than only through outside processors. The IRS pays the processor under contract and must recover the full fee from the cardholder as a separate reimbursement fee, so paying tax by card still costs more than paying from a bank account. The rules apply to payments made on or after October 19, 2026.
For the 2026 tax year the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly and $24,150 for heads of household. The top 37% rate starts at $640,600 single and $768,700 joint, and the estate tax exclusion rises to $15 million per person.
The 2025 standard deduction rises to $15,750 single and $31,500 joint. For 2025 through 2028, people 65 and older get an extra $6,000 deduction, workers can deduct up to $25,000 of tips and up to $12,500 of overtime premium ($25,000 joint), and buyers of new U.S.-assembled vehicles can deduct up to $10,000 of loan interest. Each phases out at higher incomes and can be claimed without itemizing.
From the 2027 tax year through 2029, members of the Alabama National Guard pay no Alabama income tax on the first $5,000 of pay for inactive duty training, the monthly drill weekends. Pay above $5,000 and active-duty pay are taxed as before.
For purchases from May 1 through June 30, 2026, Alabama charges no state sales tax on SNAP-eligible groceries, on top of the 2025 cut to 2%. Local city and county grocery taxes still apply during the holiday.
From the 2026 tax year through 2028, Alabama workers can subtract the extra "half" of time-and-a-half pay from state taxable income, up to $1,000 a year per taxpayer, whether or not they itemize. Base pay for overtime hours does not count, only the premium above the regular rate.
The federal deduction for the same overtime premium allows up to $12,500 a year ($25,000 joint) for 2025 through 2028, so Alabama's cap is less than a tenth of the federal single-filer limit.
Alabama's state sales tax on groceries drops from 3% to 2% on September 1, 2025, a cut of $1 on every $100 of SNAP-eligible food bought for home. Alcohol, tobacco and hot prepared food are still taxed at the full rate, and cities and counties keep charging their own grocery tax on top.
Arizona now subtracts federally deducted tips, overtime premium and the senior deduction from state income starting with 2025 returns, plus vehicle-loan interest for 2025 only. Its standard deduction matches the federal $15,750 single and $31,500 joint. From 2026, the dependent credit for children under 17 rises from $100 to $125, standard-deduction filers can add up to $1,000 ($2,000 joint) of charitable gifts, and itemized state and local taxes are capped at $10,000.
Arizona keeps its 2.5% flat rate, the lowest flat income tax in TaxMath's 2026 tables, below Louisiana's 3.0% and Colorado's 4.4%.
Arkansas's top individual income tax rate falls from 3.9% to 3.7%, retroactive to January 1, 2026, so it applies to 2026 returns filed in 2027. Taxable income above $26,400 is taxed at 3.7%; filers with net income over $94,700 pay 2% on the first $4,700 and 3.7% on the rest. The top corporate rate drops to 4.1% from 2027.
In TaxMath's 2026 tables, Arkansas's 3.7% top rate is below Missouri (4.7%), Oklahoma (4.5%) and Mississippi (4.0%) and above Louisiana's flat 3.0%; Tennessee and Texas tax no wage income.
Arkansas tablesMissouri tablesOklahoma tablesMississippi tablesLouisiana tablesTennessee tablesTexas tables
From January 1, 2026, Arkansas charges no state sales tax on food and food ingredients bought for home. City and county sales taxes on groceries still apply, so the total tax at the register depends on where you shop.
Montana homeowners who qualified for the lower 2026 homestead property tax rate but did not enroll, including people who bought after the deadline, can request a 2026 Property Tax Refund from January 1 through May 31, 2027. The home must have been their main residence for at least seven months of 2026, owned by an individual or a revocable trust, and current on property taxes.
In the grid, 0 means the jurisdiction was reviewed back to January 1, 2025 and nothing was found, and – means it has not been reviewed yet; a jurisdiction is never shown as unchanged on our silence alone. The tracker is written from TaxMath's daily review of IRS, Treasury, Federal Register and state revenue department releases. It is not legal or tax advice; read the linked source before relying on an entry. See methodology and corrections.