Historical spending analysis

Actual spending and budgeted spending are two different histories

Every budget line has two numbers attached to it from last year: what the board approved, and what the association actually spent. They are rarely identical. A landscaping line budgeted at $40,000 might have closed the year at $52,000 because of storm cleanup, a mid-year rate increase, or a contract that was never renegotiated.

Two established budgeting approaches treat that gap differently. Zero-based budgeting rebuilds each line from nothing and ignores both numbers.

"the budgeting process starts from a base of zero, with no reference being made to the prior period's budget or actual performance"

Source: Comparing budgeting techniques (Incremental v ZBB), Association of Chartered Certified Accountants (ACCA)

Incremental budgeting does the opposite: it starts from the prior period's budget or its actual performance and adds increments from there. Historical spending analysis is the work that makes sure, if your board uses that approach, the base it starts from is the real number, not the guess.

What to pull, and what a trend actually looks like

For each budget line, pull the year-end actual total, not the number the board approved, for as many past years as your books show cleanly. A single high year can be a one-time repair or an insurance claim. A steady climb across three or four years is a trend next year's budget needs to account for, not a blip to average away.

This matters most on the lines a board tends to check only against last year's budget instead of last year's actual result. A utility line budgeted at $18,000 and actually spent at $23,000 should be checked against the $23,000, and against why it happened (a rate hike, a leak, a colder winter), not carried forward as $18,000 with a small bump tacked on. See Utility forecasting for how this applies to a specific line.

Deciding what to do with the history you find

Once the actuals are in front of the board, incremental and zero-based budgeting are two ways to use them. Incremental budgeting is faster to prepare and easier to hand to a treasurer or manager, but it carries forward any inefficiency that was never re-examined. Zero-based budgeting is slower, since every line needs its own justification, but it forces the board to ask whether a contract or line item still belongs on the books at all.

Which method your board uses, and whether it applies the same method to every line or switches for a line that looks out of pattern, is a policy choice worth writing down, not something to decide silently line by line. See Zero-based budgeting and Prior-year budgeting for how each approach works in practice.