Official Tax Information Sources

TaxTrack — complete list of government sources for every tax figure shown in the app. Last generated: 2026-09-15

TaxTrack is an independent app. It is not a government app, does not represent any government entity, and is not affiliated with, endorsed by, or connected to the Internal Revenue Service (IRS), any state tax authority, or any other government agency. Every government tax figure shown in the app (rates, brackets, thresholds, deadlines and limits) comes from the official sources listed below.

1. Federal sources (IRS)

2. State sales tax economic nexus thresholds — official source for every state

For each U.S. state and the District of Columbia, the app shows the threshold published by that state and links directly to the state's official tax agency website.

StateCodeOfficial state tax agency websiteLast reviewed
AlabamaALrevenue.alabama.gov/sales-use/sales-tax-rules/2025-10-07
AlaskaAKtax.alaska.gov/2026-01-26
ArizonaAZazdor.gov/transaction-privilege-tax2026-01-26
ArkansasARwww.dfa.arkansas.gov/excise-tax/sales-and-use-tax/2026-01-26
CaliforniaCAwww.cdtfa.ca.gov/taxes-and-fees/economic-nexus.htm2026-01-26
ColoradoCOtax.colorado.gov/economic-nexus2026-01-26
ConnecticutCTportal.ct.gov/drs/sales-tax/tax-information2026-01-26
DelawareDErevenue.delaware.gov/2026-01-26
District Of ColumbiaDCotr.cfo.dc.gov/page/sales-and-use-tax2026-01-26
FloridaFLfloridarevenue.com/taxes/Pages/default.aspx2026-01-26
GeorgiaGAdor.georgia.gov/sales-tax2026-01-26
HawaiiHItax.hawaii.gov/2026-01-26
IdahoIDtax.idaho.gov/sales/2026-01-26
IllinoisILtax.illinois.gov/research/sales-tax.html2026-01-01
IndianaINwww.in.gov/dor/business-tax/sales-tax/2026-01-26
IowaIAtax.iowa.gov/sales-use-tax2026-01-26
KansasKSwww.ksrevenue.gov/sales.html2026-01-26
KentuckyKYrevenue.ky.gov/Business/Sales-and-Use-Tax/Pages/default.aspx2026-08-15
LouisianaLArevenue.louisiana.gov/SalesTax2025-10-07
MaineMEwww.maine.gov/revenue/taxes/sales-use-tax2025-10-07
MarylandMDwww.marylandtaxes.gov/business/sales-use/2025-10-07
MassachusettsMAwww.mass.gov/sales-use-tax2025-10-07
MichiganMIwww.michigan.gov/taxes/business-taxes/sales-use2026-08-15
MinnesotaMNwww.revenue.state.mn.us/sales-and-use-tax2026-08-15
MississippiMSwww.dor.ms.gov/sales-and-use-tax2026-08-15
MissouriMOdor.mo.gov/taxation/business/sales/2025-10-07
MontanaMTmtrevenue.gov/2025-10-07
NebraskaNErevenue.nebraska.gov/business/sales-and-use-tax2025-10-07
NevadaNVtax.nv.gov/2025-10-07
New HampshireNHwww.revenue.nh.gov/2025-10-07
New JerseyNJwww.nj.gov/treasury/taxation/businesses/salestax/index.shtml2026-06-11
New MexicoNMwww.tax.newmexico.gov/businesses/sales-tax/2026-08-15
New YorkNYwww.tax.ny.gov/bus/st/register.htm2025-10-07
North CarolinaNCwww.ncdor.gov/taxes-forms/sales-and-use-tax2026-01-26
North DakotaNDwww.tax.nd.gov/business/sales-use-tax2026-07-23
OhioOHtax.ohio.gov/business/sales-and-use2025-10-07
OklahomaOKoklahoma.gov/tax/businesses/sales-and-use-tax.html2025-10-07
OregonORwww.oregon.gov/dor/Pages/index.aspx2025-10-07
PennsylvaniaPAwww.revenue.pa.gov/TaxTypes/SUT/Pages/default.aspx2026-08-15
Rhode IslandRItax.ri.gov/taxation/sales-and-use-tax2026-08-15
South CarolinaSCdor.sc.gov/tax/sales-and-use2025-10-07
South DakotaSDdor.sd.gov/businesses/sales-use-tax/2025-07-29
TennesseeTNwww.tn.gov/revenue/taxes/sales-and-use-tax.html2026-08-15
TexasTXcomptroller.texas.gov/taxes/sales/2025-10-16
UtahUTtax.utah.gov/sales-and-use2025-07-01
VermontVTtax.vermont.gov/business/sales-and-use-tax2026-08-15
VirginiaVAwww.tax.virginia.gov/sales-and-use-tax2025-10-07
WashingtonWAdor.wa.gov/taxes-rates/retail-sales-tax2025-10-07
West VirginiaWVtax.wv.gov/Business/SalesAndUseTax/Pages/SalesAndUseTax.aspx2025-10-07
WisconsinWIwww.revenue.wi.gov/Pages/Businesses/Sales-and-Use-Tax.aspx2025-10-07
WyomingWYrevenue.wyo.gov/2026-01-26

3. State income tax notes (Tax Estimator)

State income tax notes link to the selected state's official tax agency website. Where a typical rate range is shown (California):

Disclaimer. TaxTrack is NOT affiliated with, endorsed by, or connected to the Internal Revenue Service, any state tax authority, or any other government entity, and it does not represent any government agency. Figures are shown for reference only and may change; always verify current figures on the official government websites listed above. TaxTrack does not provide tax advice — consult a qualified tax professional before filing.