To plan for a job change, write down three dates: your last paycheck from the old job, your first from the new one, and the day new benefits start. Add up what leaves your account between them, and check your savings cover that plus a week or two of slip.
A job change is a detour with a new ETA, not a vague leap of faith. Pay gaps, benefits gaps, and a different payday can rewrite the next six months even when the offer looks better on paper. This is for anyone weighing a move and wanting the calendar honesty before the resignation email.
You will map the gap, the new income timing, and what happens to runway so the detour has a destination date you can live with.
Offers quote annual salary. Life runs on pay dates. If your last check from the old job is March 28 and the new role pays on a two-week lag starting mid-April, you may have three to five weeks where money leaves on schedule and income does not. That stretch is the detour. Price it before you celebrate the title.
Example: take-home was $5,200 a month. New role is $5,800, but you lose two weeks of pay and buy a month of marketplace coverage at around $420. COBRA is often pricier, since you pay the full premium your employer used to share, plus a fee. Rent is still $1,950 on the 1st. The raise is real. The ETA for “we feel the raise” might be June, not the week you start.
Bonus timing matters too. Leaving before a March bonus can cost $6,000 that your mental math still counted. Vesting cliffs, unused PTO payouts, and commuting costs all belong on the same map. A prettier salary with a worse twelve-month cash path is still a detour worth measuring.
Two moves that do not belong in the gap: cashing out an old 401(k), which can trigger income tax and a 10% early withdrawal penalty, and letting health coverage lapse. Roll the 401(k) over, and confirm the exact day old coverage ends. COBRA can cost up to 102% of the full plan premium.
If you have a partner, put both of your calendars on the same line. One income pausing while the other covers the household is a shared ETA problem, not a solo adventure.
Write three dates. Last payday from the old job. First payday from the new job. Date when benefits actually start. Then ask whether runway covers the gap plus a buffer if the first check slips a week. If runway is 2.5 months and the gap is six weeks of burn at $4,000 a month, you can make it, but not if you also book a $2,000 trip in the middle.
Model the new normal after the gap. New pay amount, new pay cadence, new retirement match, maybe a longer commute at $180 a month. The detour ends when cash flow looks like the new steady state, not when you accept the offer. Knowing that ETA keeps you from spending the raise in week one of a thin checking balance.
Build a backup ETA too. What if the start date slips two weeks? What if you need another month of coverage? You do not need a disaster novel. You need one slower path so a delay does not become a credit card story.
When the numbers work, the resignation feels cleaner. When they do not, you negotiate start date, signing bonus, or a longer overlap. The timeline gives you leverage that gut feel does not.
Sample checking through the gap
Flan lets you put a job change on the projection as a timed shift in income and benefits. You can see the gap weeks, the new pay cadence, and whether runway holds before you take the turn.
A job change is a detour with a new ETA. Map the gap, the first real payday, and runway before you turn. Better offers still need honest calendars.
Once the dates are on a line, the decision gets clearer. That is the point of the map. Check how long your cushion lasts with the savings runway calculator, then read Model the raise first before the new salary lands.
Run your own numbers with the free savings runway calculator: Free runway calculator: see how many months your savings cover if income stops or drops, and how much cash you need for a 3, 6, or 12 month emergency fund.
Flan is planning software, not a bank, broker, or licensed advisor. Nothing here is financial, tax, or legal advice.
Read more Flan Files at theflan.app/blog.
