Cash Flow Forecast Generator (Simple)

Free tool: Generate a simple 13-week cash flow forecast using revenue, payroll, rent, recurring bills, and seasonality. Includes a weekly action plan and summary message.

More Bookkeeping Accounting tools

  • 1099 Contractor Tracker Template Generator — Free tool: Generate a 1099 contractor tracking template: vendor info, W-9 status, payment totals, and flags. Includes an email/SMS to request missing W-9s.
  • A/R Collections Message Generator — Free tool: Generate A/R follow-up messages (SMS/email) by invoice age, relationship strength, and tone. Includes 3 follow-ups and a final notice template.
  • Accounting Firm Proposal Template Generator — Free tool: Generate an accounting firm proposal: scope, deliverables, turnaround times, client responsibilities, and pricing structure. Includes email + follow-ups.
  • Accounting Outreach Templates (B2B) — Free tool: Generate short cold outreach templates for bookkeeping/accounting: cleanup, monthly bookkeeping, payroll, and cashflow. Includes follow-ups and yes/no CTAs.
  • Bookkeeping Cleanup Quote Estimator — Free tool: Estimate a bookkeeping cleanup quote based on how many months behind, transaction volume, payroll, and bank/credit accounts. Generates scope + timeline + message.
  • Bookkeeping Pricing Estimator (Monthly) — Free tool: Estimate monthly bookkeeping cost based on transactions, payroll, A/R-A/P needs, and cleanup. Get a range + scope + proposal text you can send.

Cash
Flow Forecast Generator (13-Week)

Know what's coming before you get squeezed.

13-week standard
Actionable insights
Owner-friendly

tl;dr

Cash Flow Forecast Generator (Simple) Free tool: Generate a simple 13-week cash flow forecast using revenue, payroll, rent, recurring bills, and seasonality. Includes a weekly action plan and summary message.

Enter your core cash inputs

Forecast Cash Flow Before You Get Squeezed

A 13-week cash flow forecast shows when money comes in, when it goes out, and whether you'll have enough. It's the most practical planning tool for avoiding cash crunches — and most businesses don't do it.

#

Why 13 Weeks?

Thirteen weeks is long enough to spot problems early but short enough to be reasonably accurate. It covers a full quarter and gives you time to act on what you see.

#

Key Inputs for Cash Flow Forecasting

Weekly revenue estimates what you expect to collect, not just invoice. Payment timing matters.

Fixed costs include rent, payroll, subscriptions, and loan payments — things that happen regardless of sales.

Variable costs scale with revenue: COGS, commissions, supplies.

Seasonal adjustments account for predictable ups and downs: holiday rushes, summer slowdowns, etc.

Starting cash is your current balance — the baseline for projecting forward.

#

What a Forecast Reveals

A good forecast shows: when cash gets tight, which weeks need attention, and whether you need to delay spending, accelerate collections, or arrange financing.

Most cash problems are predictable 4-6 weeks in advance — if you're watching.

#

Who Uses This Tool

Bookkeepers and accountants use it to provide cashflow advisory services to clients. Business owners use it to plan spending and avoid surprises.

Enter your inputs to generate a 13-week forecast and action plan.

Find customers for bookkeeping & accounting

Writly answers the calls you miss, books the job, and collects the deposit for your bookkeeping & accounting business.

Frequently asked questions

Why 13 weeks?

It's short enough to be accurate and long enough to spot cash crunches early.

What's the most common cashflow error?

Confusing profit with cash and ignoring payment timing (A/R and A/P).

How does seasonality affect the forecast?

The tool adjusts weekly revenue expectations based on the selected seasonality, either increasing or decreasing projected inflows.

Can I update the forecast if my expenses change?

Yes, you can revise your inputs at any time to generate an updated forecast reflecting the new expense structure.

Is it possible to add more expense categories?

Currently, the tool supports fixed categories but you can adjust the total recurring bills to account for additional expenses.

What if my starting cash balance is negative?

The tool will still function, providing insights into cash flow needs and helping identify weeks where additional funding might be necessary.

How accurate is the forecast?

While the tool uses your inputs to project cash flow, accuracy depends on the reliability of the data provided and any unforeseen changes in business conditions.

Can this tool be used for long-term forecasting?

The tool is designed for a 13-week period, ideal for short-term planning. For long-term forecasts, consider additional tools or consulting with a financial advisor.

This is a simplified model and not financial advice. Verify assumptions with your accountant.

Ready to grow your bookkeeping & accounting business?

Join hundreds of bookkeeping & accounting businesses using Writly to win more contracts.

Stop missing bookkeeping & accounting customer calls

© 2026 writly. all rights reserved.

Example: Cash Flow Forecast Generator (Simple) in action

Sample inputsAvg weekly revenue: 10000 · Avg weekly COGS: 3500 · Weekly payroll: 4500 · Monthly rent: 0 · Monthly recurring bills: 1000 · Seasonality next 13 weeks: Normal · Starting cash balance: 20000

13-week forecast

  • {"week":"Week 1","inflows":10000,"outflows":8231,"net":1769,"ending_cash":21769}
  • {"week":"Week 2","inflows":10000,"outflows":8231,"net":1769,"ending_cash":23538}
  • {"week":"Week 3","inflows":10000,"outflows":8231,"net":1769,"ending_cash":25307}
  • {"week":"Week 4","inflows":10000,"outflows":8231,"net":1769,"ending_cash":27076}
  • {"week":"Week 5","inflows":10000,"outflows":8231,"net":1769,"ending_cash":28845}
  • {"week":"Week 6","inflows":10000,"outflows":8231,"net":1769,"ending_cash":30614}
  • {"week":"Week 7","inflows":10000,"outflows":8231,"net":1769,"ending_cash":32383}
  • {"week":"Week 8","inflows":10000,"outflows":8231,"net":1769,"ending_cash":34152}
  • {"week":"Week 9","inflows":10000,"outflows":8231,"net":1769,"ending_cash":35921}
  • {"week":"Week 10","inflows":10000,"outflows":8231,"net":1769,"ending_cash":37690}
  • {"week":"Week 11","inflows":10000,"outflows":8231,"net":1769,"ending_cash":39459}
  • {"week":"Week 12","inflows":10000,"outflows":8231,"net":1769,"ending_cash":41228}
  • {"week":"Week 13","inflows":10000,"outflows":8231,"net":1769,"ending_cash":42997}

Key insights

  • Average weekly net cash flow: +$1,769
  • Total 13-week inflows: $130,000
  • Total 13-week outflows: $107,003
  • Ending cash balance (Week 13): $42,997

Action plan (next 2 weeks)

  • Review this forecast weekly and update with actuals
  • Flag any large unexpected expenses to adjust projections
  • Consider building cash reserve or investing in growth

Summary message (copy/paste)

Hi, Here's a quick 13-week cash flow summary: STARTING CASH: $20,000 ENDING CASH (Week 13): $42,997 NET CHANGE: +$22,997 KEY METRICS: • Average weekly net: +$1,769 • Lowest cash point: $20,000 (Week 1) • Seasonality assumption: Normal TOP PRIORITIES: • Review this forecast weekly and update with actuals • Flag any large unexpected expenses to adjust projections • Consider building cash reserve or investing in growth This is a simplified model — actuals may vary based on timing of collections and payments. Review weekly. Let me know if you want to walk through any adjustments. Thanks!

About Cash Flow Forecast Generator (Simple)

The Cash Flow Forecast Generator (Simple) is designed to give businesses a clear picture of their financial future over the next 13 weeks. By inputting expected revenue, costs, and understanding seasonal impacts, businesses can anticipate cash shortages before they happen. This proactive approach enables companies to make informed decisions, like adjusting expenses or seeking additional financing, well before cash flow issues arise.

Understanding cash flow is crucial for maintaining business operations and ensuring financial stability. This tool simplifies the forecasting process, making it accessible even for small businesses without dedicated financial teams. By focusing on a 13-week horizon, it provides actionable insights while remaining manageable and relevant to current business conditions.

How it works

  1. Collects input data for revenue, expenses, and seasonality.
  2. Calculates weekly cash flow based on input values and seasonality impact.
  3. Generates a 13-week cash flow forecast showing inflows, outflows, and net cash position.
  4. Provides a weekly action plan and summary message to guide financial decisions.

When to use it

  • Small business owners planning for seasonal fluctuations in revenue.
  • Financial managers preparing cash flow statements for upcoming quarters.
  • Entrepreneurs needing to understand cash positions before seeking additional funding.