What a 13-week forecast is
A 13-week forecast lists expected cash in and cash out week by week for the next quarter, starting from today’s bank balances. It is short enough to be accurate and long enough to show trouble coming. It is not a budget; it is a cash plan.
The inputs are mostly already in the ledger: open customer invoices with due dates, supplier bills with due dates, recurring costs such as rent and salaries, and tax payments.