The Synthetic Paycheck: How to Plan When Income Arrives in Lumps
Base + bonus + RSU + distributions = one clean monthly number. Here's the method.
7 min read · Rumesh Senanayake
Every time I meet a family where the household earns $400K but feels financially stretched, I find the same root cause: they're trying to run a monthly budget against an income that doesn't arrive monthly.
What a synthetic paycheck is
It's a single monthly number — the sustainable amount of 'household take-home' — calculated from every income source in the year, net of taxes and savings-first deposits.
- Take last year's total gross income across all sources.
- Subtract expected federal, state, FICA, and any self-employment tax.
- Subtract non-negotiable savings (401(k) max, HSA max, Roth, 529, etc.) — the stuff you want to happen before lifestyle spending ever sees it.
- Divide the remainder by 12. That's your synthetic monthly paycheck.
Why it changes behavior
Your 'monthly spend' is now anchored to a number you can actually sustain. Lumpy arrivals — bonuses, vests, distributions — land in a holding account and get swept to taxes, savings, and the household checking account at a steady cadence. No more 'flush January, tight March.'
If you can't say what a 'good month' of spending looks like, you can't know if you're on track. The synthetic paycheck fixes that first.
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