MosoFin skill · prepaid-amortization-schedule · learning guide

From one insurance policy to a three-way tie-out

This page shows how the skill builds a prepaid schedule and tests the account against it, one level at a time. It starts with one policy and one month. It ends with the balance sheet and the limits of the skill. The page quotes every rule from the skill and works every number in front of you.

The rules are the skill's ownThe page quotes each rule word for word, with the file and section it comes from.

Outside sources back the factsThey are two OpenStax textbook sections, two IFRS texts, an HMRC notice, an IRS publication and a US tax regulation. Each one has a number and a link.

The page shows the mathOpen "Check it yourself" on any level. Follow every line on a calculator.

Your numbers, your checkAt the end, spread one prepaid of your own, and tie out your own account.

Rule: quoted from the skill Fact: from a cited authority, numbered like ¹ Example: made-up figures, calculated in full

How it thinks

Ten rules the whole skill runs on

Every level below applies one or more of these rules. The examples use one made-up company, Northbrook Trading. It keeps its books in US dollars under US GAAP, with a calendar year. The month is September 2026, from Tuesday 1 September to Wednesday 30 September. The prepaid account is "Prepaid Expenses".

Learning path

Six levels, from simple to complex

Check it yourself

Spread your own prepaid, and tie out your account

Part 1 runs Steps 3 to 5 from references/method.md for one item. Part 2 runs the Step 8 tie-out. The page sends nothing anywhere.

Part 1: Spread one prepaid

The item Prepaid amount, net of recoverable tax Coverage start Coverage end Payment date (optional)

The method Convention Month to compute

The page shows the payment date next to the coverage start. It never uses the payment date in the math.

Whole-month: the monthly amount is the amount ÷ the months of coverage, rounded to the cent. The last month takes the rounding difference. For example, 1,000 over 12 months gives 83.33 × 11 = 916.63, and the last month gets 83.37. Daily: the amount ÷ the days of coverage × the days of cover in the month. Current is the part for the 12 months after the month you compute. The preset gives 600.00 for September, and 6,600.00 remains.

Part 2: Tie out the account

The two balances Prepaid account, GL closing balance Schedule sum, from your dates

The shapes you can name This month's amortization, not yet posted Missed months of amortization Items that are not prepaid

The variance is the GL balance minus the schedule sum. The preset gives a variance of 7,250.00, all of it explained. The GL balance and the roll-forward come from the same books, so their agreement is not a reconciliation. Only the schedule tests the balance.

Using it

What it asks, needs and gives back

Asks firstUse MosoFin for this run, or upload the data yourself? Which company? Which prepaid accounts? The coverage dates for each open item, and your current schedule? Your materiality threshold? Whole-month or daily? Do you recover VAT or GST at payment? Your main currency, and your policy on foreign-currency prepaids?

NeedsThe prepaid account detail back to the oldest open item, for at least 24 months, the chart of accounts and your main currency. The coverage dates come from you, because no ledger holds them.

Gives backSeven sheets: the schedule, the period detail, the tie-out, the draft entries, the changes log, the ledger findings and the coverage sheet. It asks before it makes an Excel file.

NeverThe skill never reads MosoFin without asking, and never reads data before you say yes to the read-back. It never posts, takes dates from a payment or a memo, calls a roll-forward a reconciliation, or sets your threshold.

Sources

Where every fact on this page comes from

The rules are the skill's own. The facts below come from seven outside sources. MosoFin found each one on 28 October 2026 in search results and did not open the pages. Follow the link for today's wording. Sources 5 and 6 are about US federal tax only. The skill does not apply them.

Not backed by an outside authority. The four ledger tests, the lumpiness ratio and the three-way tie-out with its variance shapes are the skill's own. So are the [auto], [gated] and [manual] verdicts, the seven sheets and the draft mark. MosoFin made up Northbrook Trading, its vendors and every figure in the examples.