Your Colorado Paycheck Changed. Here's Where the Money Went.
Colorado's flat 4.40% tax sounds simple — one rate, no brackets, no local income tax. But your paycheck has a line most calculators skip entirely: FAMLI, the paid-leave premium that takes 0.44% of every check. Add federal withholding that recalculates every period and FICA caps that reset every January, and "flat tax" doesn't mean "predictable paycheck." You still need to see what moved.
This Is What "What Changed?" Actually Looks Like
Denver worker, $55K salary, biweekly. Picked up 10 hours of overtime this period. Here's what happened to every line:
Figures below are illustrative — your actual paycheck depends on your full W-4, pre-tax deductions, and state-specific rules.
| Line Item | Last Paycheck | This Paycheck | Change |
|---|---|---|---|
| Gross pay | $2,115.38 | $2,511.98 | +$396.60 |
| Federal withholding | $170.00 | $217.59 | +$47.59 |
| Colorado state tax (4.4%) | $65.83 | $83.28 | +$17.45 |
| CO FAMLI (0.44%) | $9.31 | $11.05 | +$1.74 |
| Social Security | $131.15 | $155.74 | +$24.59 |
| Medicare | $30.67 | $36.42 | +$5.75 |
| Take-home pay | $1,708.42 | $2,007.90 | +$299.48 |
$396.60 earned. $97.12 taken across five lines. $299.48 kept. The FAMLI line is the one most people can't name — it's small, but it moves with every dollar you earn, and most online calculators leave it out entirely.
TakeHome IQ builds this comparison automatically, every pay period.
One Flat Rate, No City Tax — So Why Does Your Paycheck Still Move?
Colorado has no local income tax and a single 4.40% state rate. That removes two sources of surprise other states have. The lines that remain still change:
- State income tax (4.40% flat) — applied to your federal taxable income — not your gross. That means a 401(k) or HSA change shifts your Colorado tax too, even though the rate never moves.
- FAMLI premium (0.44% employee share) — Colorado's paid family and medical leave program takes 0.44% of wages up to the $184,500 Social Security wage base. It scales with every check — overtime and bonuses included — and stops if you cap out, then restarts in January.
- Federal withholding — recalculates every period from annualized pay. One big check — overtime, a bonus, a double shift — pushes the estimate into a higher bracket and temporarily over-withholds.
- FICA — Social Security (6.2%) caps at $184,500 and resets every January. Medicare (1.45%) never caps. If you capped out last year, your first January paycheck drops.
Flat rate, fewer lines — but four of them still move independently. Colorado paychecks are simpler than most. They are not static.
"I Worked Overtime and Barely Saw the Difference"
10 overtime hours at time-and-a-half ($26.44 base → $39.66 OT). Extra gross: $396.60.
| Where It Goes | Amount |
|---|---|
| Federal | $47.59 |
| Colorado state | $17.45 |
| CO FAMLI | $1.74 |
| FICA | $30.34 |
| You keep | $299.48 of $396.60 |
Four lines took a cut — including the FAMLI premium most calculators ignore. You kept 75.5%. Knowing that before you pick up the shift changes the decision. See the exact impact of overtime hours before you work them.
"$3,000 Bonus — I Got $1,965"
| Tax | Withheld |
|---|---|
| Federal (22% flat on bonuses) | $660.00 |
| Colorado state (4.4%) | $132.00 |
| CO FAMLI (0.44%) | $13.20 |
| Social Security | $186.00 |
| Medicare | $43.50 |
| You keep | $1,965.30 |
34% gone on payday. Colorado withholds its flat 4.4% on supplemental wages, and FAMLI takes its cut of the bonus too. If you're actually in the 12% federal bracket, some of that 22% comes back at tax time — but that's months away. See what your next bonus actually looks like in your pocket.
"Nothing Changed, But My Pay Dropped"
It happens in Colorado too. The usual culprits:
- January reset — Social Security and FAMLI both un-capped. If you passed the $184,500 wage base last year, two lines just came back on your first January paycheck.
- A pre-tax deduction changed — because Colorado taxes federal taxable income, a 401(k) or HSA change moves your state tax line too — one enrollment change, three lines shift.
- Federal bracket drift — your annualized wages crossed into the next federal bracket mid-year. Same gross, higher withholding per period.
- Open enrollment processed — your health premium or retirement contribution changed, reducing take-home directly.
A calculator can't tell you which one happened. A side-by-side comparison can. TakeHome IQ shows you exactly which line moved.
Every Colorado Paycheck Calculator Online Gets This Wrong
They see "flat 4.4%" and stop there. They output a number.
That number misses what actually moves on a Colorado paycheck, because:
- They skip the FAMLI premium entirely — 0.44% of every check, invisible to them
- They apply 4.4% to gross instead of federal taxable income, so your 401(k) and HSA are mispriced
- They don't model the $184,500 caps on Social Security and FAMLI
- They can't track what changed from your last paycheck
- They run once — your paycheck changes every period
Colorado workers don't need a calculator. You need a tool that models every line — FAMLI included — remembers your last paycheck, and shows you what moved. That's TakeHome IQ.
Your Next Payday Is Coming
Know the number before it hits your bank account. Enter your hours, your deductions, any overtime — and see your real Colorado take-home, FAMLI line and all. Not a state average. Not a guess. Your paycheck, line by line.
Then next pay period, do it again — and see exactly what changed.