State support
2026 state coverage
Every state has a launch status. Blocked states are intentionally not calculated — we show a reason and next action instead of a misleading estimate.
| State | Launch status | Calculation status | Limitations | Source year | Next action |
|---|---|---|---|---|---|
| Alabama (AL) | Coming soon | unsupported / blocked | AL_REQUIRES_FEDERAL_WITHHOLDING_DEPENDENCY | 2026 | Extract schedules and implement dedicated strategy after CPA review. |
| Alaska (AK) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| Arizona (AZ) | Limited | partial_support / limited | AZ_A4_SCOPE_LIMITED | 2026 | Add additional Arizona-specific fields only when source-backed. |
| Arkansas (AR) | Coming soon | unsupported / blocked | AR_TABLE_EXTRACTION_NEEDED | 2026 | Extract official regular 2026 tables and formula. |
| California (CA) | Limited | prior_year_used / limited | PRIOR_YEAR_STATE_TABLE | 2026 | Build dedicated CA Method B strategy. |
| Colorado (CO) | Limited | partial_support / limited | CO_DR0004_SCOPE_LIMITED | 2026 | Add DR 0004 input model if approved. |
| Connecticut (CT) | Coming soon | unsupported / blocked | CT_W4_TABLES_MODEL_NEEDED | 2026 | Implement CT-specific model after extraction. |
| Delaware (DE) | Limited | partial_support / limited | DE_EXACT_COMPUTATION_SCOPE_LIMITED | 2026 | Add certificate variants only after official form semantics are modeled. |
| Florida (FL) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| Georgia (GA) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Hawaii (HI) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Idaho (ID) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Illinois (IL) | Limited | partial_support / limited | IL_LINE2_ALLOWANCES_UNSUPPORTED | 2026 | Add Line 2 allowance input when approved. |
| Indiana (IN) | Coming soon | unsupported / blocked | IN_COUNTY_MODEL_NEEDED | 2026 | Design Indiana state/county model. |
| Iowa (IA) | Limited | partial_support / limited | IA_LEGACY_W4_UNSUPPORTED | 2026 | Future legacy form support phase. |
| Kansas (KS) | Coming soon | unsupported / blocked | KS_2026_SOURCE_VERIFICATION_NEEDED | 2026 | Verify official 2026 KW-100/table before extraction. |
| Kentucky (KY) | Supported | official_2026 / supported | None | 2026 | Keep source evidence current. |
| Louisiana (LA) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Maine (ME) | Coming soon | unsupported / blocked | ME_PHASEOUT_MODEL_NEEDED | 2026 | Design Maine percentage/table strategy. |
| Maryland (MD) | Coming soon | unsupported / blocked | MD_COMBINED_STATE_LOCAL_NEEDED | 2026 | Implement combined state/local model. |
| Massachusetts (MA) | Coming soon | unsupported / blocked | MA_M4_SURTAX_MODEL_NEEDED | 2026 | Design Massachusetts-specific strategy. |
| Michigan (MI) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Minnesota (MN) | Coming soon | unsupported / blocked | MN_TABLE_EXTRACTION_NEEDED | 2026 | Extract 2026 tables/instructions. |
| Mississippi (MS) | Limited | partial_support / limited | MS_MARRIED_BOTH_WORK_CUSTOM_EXEMPTION_SPLIT_DEFERRED | 2026 | Add custom married-both-work exemption split model if approved. |
| Missouri (MO) | Limited | partial_support / limited | MO_MARRIED_STATUS_SCOPE_LIMITED | 2026 | Add Missouri-specific married spouse-work status input if needed. |
| Montana (MT) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Nebraska (NE) | Coming soon | unsupported / blocked | NE_MINIMUM_WITHHOLDING_MODEL_NEEDED | 2026 | Design Nebraska-specific table/minimum strategy. |
| Nevada (NV) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| New Hampshire (NH) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| New Jersey (NJ) | Coming soon | unsupported / blocked | NJ_2026_CURRENTNESS_VERIFICATION_NEEDED | 2026 | Verify 2026 applicability and extract tables. |
| New Mexico (NM) | Coming soon | unsupported / blocked | NM_TABLE_SOURCE_NEEDED | 2026 | Locate official current withholding tables/formula. |
| New York (NY) | Limited | prior_year_used / limited | PRIOR_YEAR_STATE_TABLE | 2026 | Build NY withholding-method strategy. |
| North Carolina (NC) | Limited | partial_support / limited | NC_DEFAULT_NO_ALLOWANCE_ONLY | 2026 | Add certificate variants only when source-backed. |
| North Dakota (ND) | Limited | partial_support / limited | ND_PRE2020_W4_UNSUPPORTED | 2026 | Add legacy/pre-2020 method only with explicit input model. |
| Ohio (OH) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Oklahoma (OK) | Limited | partial_support / limited | OK_HOH_UNSUPPORTED | 2026 | Decide whether head-of-household can be source-mapped; wage-bracket table lookup remains deferred. |
| Oregon (OR) | Coming soon | unsupported / blocked | OR_ALLOWANCE_MODEL_NEEDED | 2026 | Extract full default path and design stateForms.OR. |
| Pennsylvania (PA) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| Rhode Island (RI) | Coming soon | unsupported / blocked | RI_OFFICIAL_PDF_RETRIEVAL_BLOCKED | 2026 | Owner should provide an accessible official PDF/source snapshot or copied official table text. |
| South Carolina (SC) | Supported | official_2026 / supported | None | 2026 | Keep tests current. |
| South Dakota (SD) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| Tennessee (TN) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| Texas (TX) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| Utah (UT) | Coming soon | unsupported / blocked | UT_PUB14_EXTRACTION_NEEDED | 2026 | Extract Pub 14 current schedule. |
| Vermont (VT) | Coming soon | unsupported / blocked | VT_SOURCE_NOT_FOUND | 2026 | Recheck Vermont Department of Taxes. |
| Virginia (VA) | Coming soon | unsupported / blocked | VA_VA4_SCOPE_LIMITED | 2026 | Design VA-4 input model and extract formula/tables. |
| Washington (WA) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| West Virginia (WV) | Coming soon | unsupported / blocked | WV_ONE_TWO_EARNER_SCOPE_LIMITED | 2026 | Extract March 2026 tables and one-/two-earner mapping. |
| Wisconsin (WI) | Coming soon | unsupported / blocked | WI_WT4_MODEL_NEEDED | 2026 | Design WT-4 model and extract tables. |
| Wyoming (WY) | No income tax | official_2026 / supported | None | 2026 | Keep source evidence current. |
| District of Columbia (DC) | Coming soon | unsupported / blocked | DC_TABLE_SOURCE_NEEDED | 2026 | Locate official current OTR withholding tables/formula. |