RRSP room, deduction and withdrawals

The rules

Room accrues at 18% of the previous year's earned income, capped at the annual dollar limit, and unused room carries forward indefinitely.
A contribution is deducted from taxable income for the year.
A withdrawal is taxable income in the year it is taken, on top of everything else you earn, and the institution withholds tax at source.
No contributions after the end of the year you turn 71, when the plan must wind up.

Accrues room per person from the plan's own salaries, carries it forward, and trims a contribution that would exceed it rather than silently over-contributing.
Values the deduction as a refund the following April, priced at that person's marginal rate, together with any FHSA deduction on the same income.
Taxes withdrawals at the owner's own rate, and treats withholding as an approximation: the exact schedule depends on the size and timing of each withdrawal.
Assumes zero carried-forward room at the start of the plan unless the inputs say otherwise. Most people have some, so the projection under-uses the RRSP rather than over-.

Spousal RRSPs are not modelled; see taxes are per person. Pension adjustments from an employer plan, which reduce room, are not modelled either.