Charge texts you at 7am: can you come in Sunday? Your brain does a quick calculation — overtime rate, 12 hours, sounds good. But gross pay and net pay are very different things, and most nurses say yes to shifts they'd say no to if they knew the real number. Here's how to actually do the math.
The gross pay trap
Your hospital shows your overtime rate as $57/hr on your pay stub. That's before federal taxes, FICA (7.65%), and any state income tax. For most nurses earning $60,000–$90,000 base, the effective federal marginal rate on overtime hours is 22–24%. Add FICA and you're losing 30%+ immediately. A $684 gross shift (12hrs × $57) might net $468 before you account for anything else.
The gap between gross and net on a single shift is typically $150–$250 depending on your income level and state.
Overtime threshold timing matters
Not every extra shift triggers overtime. If you're at 30 hours for the week, only the hours above 36 (or 40, depending on your hospital's policy) pay at 1.5x. A 12-hour shift added to a 30-hour week gives you 6 hours at straight time and 6 hours at OT — not 12 hours of OT. The total gross is significantly lower than nurses assume.
Differentials don't always multiply
Weekend differential ($3–$5/hr) and night differential ($2.50–$4.50/hr) are typically added per hour at straight time — they do NOT multiply with your overtime multiplier at most hospitals. So stacking a Saturday night shift doesn't give you 1.5x of (base + diff). It gives you (1.5x base) + (1x diff). Verify your hospital's policy because this is one of the most misunderstood rules in nursing pay.
Always check your hospital's OT calculation policy. Some calculate OT on total compensation including diffs, most don't.
Your real costs: the hidden subtraction
Before you decide, subtract these from your net pay:
Childcare: $60–$120 for a weekend shift if you have kids
Gas/parking: $15–$40 round trip depending on your commute
Food: $12–$25 (you're not packing lunch at 5am)
Clothing/scrubs wear: minor but real
Time cost: If you value your off day at even $15/hr for decompression, a 14-hour door-to-door day costs $210 in opportunity.
A $684 gross shift can realistically net you $280–$350 in your pocket after taxes and costs. That's $20–$25/hour true net for an ICU shift. Some nurses find that acceptable. Some don't. The point is to know the number before you commit.
When it IS worth it
Extra shifts make the most financial sense when:
- You're already at or near your OT threshold for the week (hours 37+ maximize the 1.5x benefit)
- You have no childcare costs
- You're building toward a specific goal (CRNA savings, debt payoff, emergency fund)
- It's a facility you're already credentialed at (zero extra credential cost)
- The shift is on a day you'd otherwise spend money (Saturday night shift = $0 going out)
The math changes completely when you're using the extra income purposefully versus just accumulating shifts.
When it's NOT worth it
Decline or seriously reconsider when:
- You're under your OT threshold and won't hit 1.5x (you're working for straight time)
- You have $80+ in childcare costs eating the margin
- You're already fatigued — burnout has a real financial cost if it affects your primary job
- You're maxing out pension/retirement already (you can't tax-shelter the extra income)
- The facility is far and you're at risk for mandatory OT (you could end up with a worse deal)
The nurses who manage their income best aren't the ones who say yes to every shift — they're the ones who know their real number and make decisions based on it. Run the calc first, decide second. Your Saturday night is worth knowing exactly what you're getting paid for it.