ISP Break-Even Analysis: $192K Monthly Revenue to Cover Costs

Fixed costs $28.6K/mo Fixed overhead base

Contribution margin 81.5% After variable costs

Break-even revenue $35.1K/mo Monthly target

Break-even timing Month 6 Launch ramp

Break-even calculator

Use this to test monthly revenue, variable expenses, and fixed costs against break-even for an internet service provider.

Lean Base Full

Monthly revenue Revenue is the pool that covers variable costs and fixed overhead. $ Low run rate High run rate Variable expenses Use direct costs that rise with revenue, like backhaul and support. $ Light costs Heavy costs

Money available to cover fixed costs $169,112 $207,500 revenue - $38,388 variable expenses

Margin ratio

81%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead your margin has to cover. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which internet service provider expenses are fixed, and which move as subscribers grow?

Cost classification

Break-even is reported in Month 6, but it only holds if recurring bandwidth, support, and field labor scale correctly. Treating usage-driven spend as fixed can overstate margin and hide the Month 8 cash low point.

Expense	Cost	Break-Even Treatment	Common Mistake
Network Operations Center Facility	Fixed	Include $12,000 per month from Month 1 to Month 60 in fixed monthly overhead before contribution margin.	Cutting it when subscribers fall, even though the facility commitment remains.
Software Licensing and CRM Systems	Fixed	Include $8,500 per month as fixed overhead for billing, customer records, and sales workflow.	Tying the full license bill to each new subscriber instead of the base operating platform.
Office and Administrative Facilities	Fixed	Carry $5,500 per month as a fixed facilities charge during the planning range.	Dropping office expense too early because subscriber revenue ramps.
Internet Backhaul and Transit Fees	Variable	Model as revenue-linked spend: 12.0% in Year 1, declining to 9.0% by Year 5.	Treating recurring bandwidth as capital expenditure or a one-time network build.
Network Maintenance and Support	Variable	Apply 6.5% of revenue in Year 1, declining to 4.5% by Year 5 as scale improves.	Holding support flat while tickets, outages, and device counts rise.
Vehicle Fleet Maintenance and Fuel	Semi-variable	Start with the $6,200 monthly base, then flex for install routes, truck rolls, and service calls.	Treating every fleet dollar as fixed when field activity rises.
Utilities for Network Infrastructure	Semi-variable	Start with the $7,300 monthly base, with usage pressure as network load grows.	Leaving power and infrastructure utilities flat during higher bandwidth use.
Field Service and Support Staffing	Semi-fixed	Model staff in steps: field technicians rise from 3.0 to 12.0 FTE, installation crew from 4.0 to 15.0 FTE, and support from 2.0 to 9.0 FTE.	Modeling install labor as one-time only or support as flat when tickets rise.

How does break-even change from a lean launch to full ISP rollout?

Scenario table

Break-even climbs as the ISP moves from lean launch to full rollout because fixed staffing and network overhead rise faster than margin. The model still reaches operating break-even in Month 6, but cash bottoms near $4.31M.

Planning assumptions only; actual break-even will move with mix, churn, and install pace.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch, Year 1 staffing	$1.919M	$355k	$1.564M	81.5%	$0	About 19,200 subscribers at the Year 1 bill mix.
Base growth, Year 3 staffing	$2.811M	$436k	$2.376M	84.5%	$0	Month 6 operating break-even, with about 25,400 subscribers and a $4.31M cash low point.
Full rollout, Year 5 scale	$3.584M	$484k	$3.101M	86.5%	$0	About 29,300 subscribers cover the larger fixed load.

What breaks the Internet Service Provider break-even plan?

Stress test

The plan has little cushion: Year 1 break-even is $1.919M, and Month 8 cash already bottoms near negative $4.31M. Slower installs, higher support visits, or bandwidth cost pressure can push break-even to $2.067M fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change from the first-year model.	$1.919M	$0 gap	No cushion; any miss turns into burn.
Revenue shortfall	Monthly revenue lands $100,000 below plan.	$1.919M	$100,000 gap	Slower subscriber ramp opens an immediate hole.
Fixed-cost pressure	Fixed overhead rises by $100,000 a year.	$2.042M	$123,000 gap	Extra overhead pushes break-even past the first-year cushion.
Margin pressure	Variable expense rises 1 point from support and truck rolls.	$1.943M	$24,000 gap	More visits and bandwidth fees eat the margin fast.
Combined pressure	Fixed overhead rises $100,000 and margin falls 1 point.	$2.067M	$148,000 gap	Delayed activations and cost creep can break cash timing.

Can this territory support break-even before you lock the fiber build?

Founder checklist

Break-even shows up by Month 6, but cash still bottoms at negative $4.31 million in Month 8. So don’t commit to the fiber build until demand, install capacity, and working capital all line up.

1Demand Proof1,360 subs

Confirm the launch territory can support about 1,360 active subscribers at Year 1 mix, or the $450,000 marketing budget and $2.5 million fiber build will outrun demand.

2Fixed Load$110.6K/mo

Check that monthly fixed overhead and payroll stay near $110,550, because that is the cash floor you have to cover before growth helps.

3Margin Check81.5% CM

Verify backhaul and support stay at 18.5% of revenue in Year 1, so each $1 of sales leaves 81.5 cents for fixed costs and reserves.

4Install Capacity3 techs, 4 installers

Make sure three field technicians and four installation crew FTEs can keep installs moving, because slow installs push revenue out and raise support tickets.

5Cash CushionMonth 8

Plan cash for the Month 8 trough of negative $4.31 million, since the build burns hard before the payback line.

6Support Ramp2 to 9 FTE

Confirm billing, CRM, and support workflows before launch, because customer support grows from 2 FTEs to 9 FTEs and the $8,500 monthly software load needs clean handoffs.