Park three to six months of expenses in a high-yield savings account and pay yourself the same date each month, regardless of invoices. In fat months, refill the buffer. In lean months, the buffer covers the gap while contributions continue smoothly.
Pick a simple percentage-of-income rule, like 20 percent to investments after taxes and 5 percent to debt, with a small floor in slow seasons and a ceiling in windfalls. Automate the sweep, then stop tweaking. Consistency beats perfect timing.