Notes on cash, for owners.

Practical pieces on forecasting, cash floors, slow seasons and big decisions, written by people who have kept the books for small businesses.

Forecasting

Cash basics

Planning

Decisions

Cash terms, in plain words.

The six words that come up in every article, defined the way we would explain them across a kitchen table.

Runway

How many months your cash lasts at today’s rate of spending, after the income you expect. Tarn measures it every morning from real balances.

Cash floor

The lowest balance you agree to keep. It covers a few weeks of fixed costs, money held for others such as sales tax, and one bad surprise.

Burn

How much more cash leaves than arrives in a typical month. A business can be profitable on paper and still burn cash while it waits to be paid.

13-week forecast

A week-by-week view of cash for the next quarter, built from expected receipts and known payments. The standard short-range forecast lenders ask for.

Days sales outstanding

The average number of days between sending an invoice and being paid. Every day it falls is cash you hold sooner.

Scenario

A copy of your forecast with one change applied, such as a hire or a late client, so you can see its effect before you commit.

Your next eighteen months, mapped.

Connect a bank in ten minutes and see this year’s tight weeks before lunch.

Cash-flow forecasting for small and mid-size businesses.

The Tarn letter: one cash-flow idea a month

© 2026 Tarn Software Ltd

Read-only bank access · Data encrypted at rest

tarn

Your next eighteen months, mapped.

Connect a bank in ten minutes and see this year’s tight weeks before lunch.

Cash-flow forecasting for small and mid-size businesses.

The Tarn letter: one cash-flow idea a month

© 2026 Tarn Software Ltd

Read-only bank access · Data encrypted at rest

tarn

Your next eighteen months, mapped.

Connect a bank in ten minutes and see this year’s tight weeks before lunch.

Cash-flow forecasting for small and mid-size businesses.

The Tarn letter: one cash-flow idea a month

© 2026 Tarn Software Ltd

Read-only bank access · Data encrypted at rest

tarn

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