How to Create a Cash Flow Forecast

Stop Guessing. Start Planning.

For many roofing companies, cash flow feels unpredictable.

One week, you’re flush with cash. The next, you’re wondering how everything got so tight, despite having a full schedule of jobs.

Here’s the reality:

Cash flow isn’t something you hope works out. It’s something you plan.

A simple cash flow forecast gives you visibility into what’s coming so you can make smart decisions before pressure hits.

And the best part? It doesn’t have to be complicated.

What Is a Cash Flow Forecast?

A cash flow forecast is a simple projection of:

• Money coming in (customer payments)

• Money going out (materials, labor, overhead)

• Your expected cash balance over time

Instead of reacting to your bank balance, you’re anticipating it.

👉 It turns “I think we’ll be fine” into “I know exactly what’s coming.”

Why Roofing Companies Need This

Roofing businesses are especially vulnerable to cash flow swings because:

• Materials are paid upfront

• Labor is paid weekly

• Customer payments can be delayed

• Jobs don’t always line up perfectly

Without a plan, even profitable companies can run into cash shortages.

👉 Profit doesn’t guarantee cash; timing does.

Step 1: Start With Your Current Cash

Begin with what’s real.

• Current bank balance

• Any available reserves

This is your starting point.

Everything in your forecast builds from here.

Step 2: Map Out Incoming Cash

Next, list expected cash inflows over the next 4–8 weeks.

For roofing companies, this usually includes:

• Deposits on upcoming jobs

• Progress payments

• Final payments on completed jobs

• Any outstanding receivables

Be realistic, not optimistic.

Ask yourself:

• When will this actually be paid?

• Are there any delays I should expect?

👉 A conservative forecast is a useful forecast.

Step 3: Map Out Outgoing Cash

Now list everything going out.

Break it into categories. Here are some examples:

Fixed Expenses - predictable, recurring expenses

• Rent or office costs

• Insurance

• Software subscriptions

• Admin salaries

Variable Expenses - expenses that change in amount (often a percentage of revenue)

• Materials for scheduled jobs

• Subcontractors or labor

• Fuel and equipment costs

Irregular / Large Expenses - one-time or rare payments you expect to hit your account

• Equipment purchases

• Tax payments

• Annual renewals

Include timing here, too. When each expense hits matters just as much as the amount.

Step 4: Build a Simple Weekly View

Instead of thinking monthly, break your forecast into weekly chunks.

Why?

Because cash problems don’t show up monthly, they show up week to week.

Your forecast should look something like this:

• Week 1: Starting cash + inflows – outflows = ending cash

• Week 2: Starting cash (from Week 1) + inflows – outflows

• And so on

This rolling view helps you spot tight periods early.

👉 Clarity lives in the details, and weekly is where it shows up.

Step 5: Identify Gaps Before They Happen

Once your forecast is built, look for:

• Weeks when cash gets tight

• Large expenses hitting at once

• Delays between outflows and inflows

This is where the real value is.

Because now you can act before there’s a problem.

Step 6: Make Adjustments Proactively

If you spot a gap, you have options:

• Speed up collections on receivables

• Require deposits on upcoming jobs

• Delay non-essential expenses

• Adjust scheduling of jobs or material orders

The key is timing.

👉 Small adjustments early prevent big problems later.

Step 7: Update It Regularly

A forecast isn’t “set it and forget it.”

Things change:

• Jobs get delayed

• Payments come in late

• Costs shift

Update your forecast:

• Weekly during busy season

• At least monthly year-round

👉 A forecast is only useful if it reflects reality.

Common Mistakes to Avoid

Let’s keep you out of trouble.

1. Being too optimistic
Assuming payments will come in faster than they actually do.

2. Forgetting irregular expenses
Taxes and large purchases can throw everything off.

3. Not updating the forecast
An outdated forecast is worse than none at all.

4. Making it too complicated
If it’s hard to maintain, you won’t use it.

👉 Simple and consistent beats complex and ignored.

What This Changes for Your Business

When you have a clear cash flow forecast, everything feels different:

• You make decisions with confidence

• You avoid last-minute stress

• You protect your operations during slowdowns

• You stay in control, even during busy season

Instead of reacting to your bank account…

You’re leading your business with intention.

Final Thought

Cash flow problems don’t usually come from a lack of revenue.

They come from a lack of visibility.

A simple forecast fixes that.

Because when you know what’s coming, you stop guessing and start making better decisions.

Want Help Building This?

At Wise Bookkeeper, we help roofing companies create simple, reliable cash flow systems that actually get used.

If you’re tired of uncertainty around your cash and want a clear plan instead, we can help you build it.

Let’s take the guesswork out of your numbers.