The question every partner asks after a month closes is not “what is our margin” but “why did it change”. Most firms answer it by hand. In October 2026, Teamwork.com published a five-lever method for it: on an $80,000 fixed-fee project quoted at 45% margin, $36,000 became $22,900 once leakage, staffing mix, extra effort and unbilled scope were counted. The method works, but it is manual and covers one closed project at a time.
A bridge, every day, for the whole firm
KPilot keeps a version of the P&L every night and lets you save your own, such as the budget. Pick any two and the bridge splits the move into drivers: team and staffing, deals, planned invoicing, late invoicing, budgets and actuals. The tiles add up exactly to the change, so nothing hides in an “other” line you cannot explain.
What it reads like
At Mesabrook, operating margin is 1.5 points lower than at the end of October. Team and staffing account for −$61,400, mostly the extra days on Lone Star. Deals add $38,500. Planned invoicing that slipped costs −$47,600, and invoices issued late another −$31,200. Each tile opens the records behind it, and the trail says who changed what, and when.
From explanation to action
An explanation is most useful when it leads to an action. The slipped invoices are already in Margin Guard’s ledger, and the Lone Star overrun comes with a drafted change order. Instead of rebuilding the story each month, the team gets a list of actions for the week.