Methodology

What our dates and sources mean

A publication date says when an article first appeared. A modification date records a change; it does not certify a complete factual review. A review date records the stated review, and a product field check applies only to the fields listed. A source link alone does not establish that every claim is current.

Our catalog includes reference data that has not been fully reverified. Use the evidence on the specific page and confirm an offer’s terms with the provider. Report a suspected error through our contact page.

All SmartRates calculators use industry-standard financial formulas:

• Mortgage & Loan Payments: M = P·r(1+r)ⁿ / [(1+r)ⁿ−1], where P = principal, r = monthly rate, n = total payments • Compound Interest: FV = PV·(1+r/12)^(12·t) + PMT·[(1+r/12)^(12·t)−1]/(r/12) • Retirement Projections: Future value of ordinary annuity with monthly compounding • Federal Income Tax: 2026 IRS marginal brackets, standard deduction, and FICA rates • 401(k) Limits: 2026 IRS elective deferral limit ($24,500; $32,500 age 50+)

Tax figures are sourced from IRS guidance. We review calculators when new IRS data is released.

We evaluate credit cards across the following criteria:

• Rewards Rate — headline earn rate on primary spend categories • Annual Fee — net cost after factoring in recurring credits • Welcome Bonus — value of signup bonus relative to spend requirement • APR Range — regular variable APR low and high ends • Benefits — travel protections, cell phone coverage, lounge access • Credit Score Requirement — estimated minimum FICO score to qualify

Issuer terms are the primary reference. Some product pages include dated checks of specific fields; those checks do not verify every field or every offer. Reference APR ranges may be stale and variable rates can change. Confirm the current terms on the issuer’s website before applying.

Personal and auto loans are evaluated on:

• APR Range — lowest and highest advertised rates (lowest typically for excellent credit) • Loan Amount Range — minimum and maximum available • Term Options — shortest to longest available repayment period • Origination Fee — upfront fee deducted from proceeds • Minimum Credit Score — approximate FICO required to qualify • Funding Speed — typical time from approval to fund receipt • Special Features — co-signer options, direct creditor pay, hardship programs

APR ranges are reference figures sourced from lender websites. A recorded check covers only its stated fields and date. Actual offers depend on the applicant and can differ; confirm the current APR, fees, term, and eligibility directly with the lender.

Our state income tax pages use the Tax Foundation's annual state individual income tax rates and brackets table, which compiles state statutes, forms, and filing instructions. We record each state's wage-income tax structure, statutory rate or marginal rate range, and the top single-filer bracket threshold. We also link readers to USA.gov's directory of official state tax agencies for filing instructions and primary-source confirmation.

Paycheck examples on state pages are planning illustrations, not tax-return calculations. Flat-tax examples apply the statutory rate to gross pay; graduated-tax examples use a clearly disclosed adjustable planning rate. These examples do not claim to model every bracket, deduction, exemption, credit, local tax, retirement exclusion, capital-gains rule, or residency rule.

Before publishing a new tax year, the editorial team checks the source table, compares changed figures with state legislation or agency instructions, updates the shared review date, rebuilds all state pages, and runs the site's freshness and production-build checks.

Online brokers are evaluated on:

• Commission Schedule — stock, ETF, and options trade costs • Account Minimum — minimum deposit to open an account • Account Types — individual, IRA, joint, trust, etc. • Platform Quality — research tools, charting, mobile app • Special Features — fractional shares, crypto, paper trading, margin rates • Customer Service — availability and channel options

Data is sourced from broker fee schedules and updated when brokers announce changes. Commission structures evolve; always verify the current fee schedule with the broker before opening an account.

SmartRates does not earn affiliate commissions or referral fees from "Apply" or "Open Account" links. We receive fees for clearly labeled sponsored placements. Paid placement does not determine our independent rankings or calculator results. See our Advertiser Disclosure for the current arrangements.

Google AdSense display ads are not currently enabled. Sponsored sections are labeled where they appear. If display advertising is enabled later, ad revenue will not influence which products are listed, how they are ranked, or what data we report. Products are ranked solely on the evaluation criteria described above.

Our review targets depend on the type of information: tax tables and contribution limits when official rules change, product terms when offers change, and market figures according to the source’s publication schedule. A target is not evidence that a review has been completed.

On product pages, use the “Product data verification” note to see which fields were checked, the check date, and the provider source. If no check is recorded, treat figures as a reference snapshot. Calculator pages show their methodology and sources where available.