Custom PC Building Break-Even Analysis: $23K Monthly Revenue

Fixed costs $5.3K/mo Base overhead

Contribution margin 80.9% After variable costs

Break-even revenue $6.5K/mo Cover target

Break-even timing Month 1 Launch month

Break-even calculator

Test whether monthly revenue from custom PC builds covers direct build costs and the fixed shop cost base.

Lean Base Full

Monthly revenue Revenue is the cash pool that has to cover direct costs and then fixed costs. $ Lower sales Higher sales Variable expenses These are direct build costs that move with sales, like components, packaging, and fees. $ Lower costs Higher costs

Money available to cover fixed costs $167,940 $197,533 revenue - $29,593 variable expenses

Margin ratio

85%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base that break-even revenue must absorb. $ Lean overhead Higher overhead

Break-even chart Revenue Total costs

Which custom PC builder expenses are fixed, and which move with sales?

Cost classification

Break-even is reliable only when parts, fees, rent, and labor sit in the right buckets. Keep pass-through build parts separate from overhead, so each added PC shows its true margin.

Expense	Cost	Break-Even Treatment	Common Mistake
Workshop Rent	Fixed	Include $2,500 per month in monthly overhead.	Allocating rent into each build like parts.
Software Subscriptions	Fixed	Include $750 per month before unit margin.	Letting subscription spend rise with every sale.
Component Costs	Variable	Model $100 to $450 per unit in the first year by build type.	Mixing parts pass-through into rent and payroll.
Revenue-Based Build COGS	Variable	Apply 3.0% of revenue for consumables, licensing, packaging, testing, and setup.	Treating small build supplies as fixed overhead.
Payment Processing Fees	Variable	Apply 2.5% of first-year sales revenue.	Modeling card fees as a flat monthly charge.
Affiliate Marketing Commissions	Variable	Apply 2.0% of first-year referred sales revenue.	Treating commissions like fixed ad spend.
Utilities	Semi-variable	Start with the $600 monthly base, then track bench usage pressure separately.	Ignoring higher power use as testing volume rises.
Technician and Operations Staffing	Semi-fixed	Add labor in steps as build volume rises, including added technicians and operations roles.	Assuming payroll grows smoothly with each PC sold.

How does break-even shift across lean, base, and full custom PC build plans?

Scenario table

Lean sits near 11 builds a month, base uses the Year 1 mix, and full only works if the shop can keep up with demand and staffing. CM ratio is what’s left after variable costs, before fixed costs.

These are planning assumptions built from the model inputs, not a promise of future results.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean custom PC build shop	$24.5k	$4.7k	$18.8k	80.9%	$1.1k	Near break-even; a small dip in builds turns profit negative.
Base custom PC build shop	$94.8k	$18.1k	$18.8k	80.9%	$57.9k	Healthy cushion; this is the first clearly scalable setup.
Full custom PC build shop	$338.3k	$62.4k	$41.3k	81.6%	$234.7k	Strong profit, but only if capacity and hiring keep pace.

What breaks the break-even plan if demand softens or costs jump?

Stress test

The base plan has a wide cushion, but it gets thinner fast if leads slow, components get pricier, or discounts pile up. Here’s the quick math: the business still clears break-even in each stress case, but the margin gets much less comfortable.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change to the current revenue mix, fixed costs, or variable expense rate.	$23,227	$71,606 cushion	The plan clears break-even with room to spare.
Demand drop	Monthly revenue falls 25% to about $71,125.	$23,227	$47,898 cushion	Lower lead flow cuts profit, but break-even still holds.
Overhead rise	Fixed costs rise 20% to $22,550 a month.	$27,868	$66,965 cushion	Rent and payroll pressure push the break-even line higher.
Margin hit	Variable expense rate rises 5 points and contribution margin falls to 75.9%.	$24,768	$70,065 cushion	Refund leakage, overtime, or discounts can erode the cushion.
Combined pressure	Revenue falls 25%, variable expense rate rises 5 points, and fixed costs rise 20%.	$29,735	$41,390 cushion	The model still works, but the buffer is much tighter.

What should you verify before you sign the workshop lease, hire staff, or buy parts?

Founder checklist

Don’t lock in the lease or hires until the pipeline, parts flow, and bench can support break-even. Here’s the quick test: 11+ builds a month, $18.8K of monthly fixed load, and enough cash to stage the $82K capex plan without panic.

1Demand proof11+/mo

Do not add fixed overhead until you can show at least 11 builds a month; the Year 1 plan calls for 510 builds, so the early pipeline must already be real.

2Fixed load$18.8K/mo

Year 1 fixed costs are about $5,250 a month plus $13,542 of payroll, so verify that sales can cover the workshop before you add more staff.

3Build margin85% CM

At the Year 1 mix, revenue is about $1.138M and listed variable costs are about $166K, which leaves about 85% contribution margin before fixed payroll and rent; keep warranty and post-sale support in the cost stack.

4Capacity ramp510 builds

The first-year target is 510 builds, or about 42.5 a month, so confirm the founder and one assembly tech can hit that throughput before you ramp headcount.

5Cash cushion$1.202M

Treat the minimum cash figure as a reserve target, not profit; it hits in Month 1, so the launch needs enough runway for deposits, slow starts, and uneven demand.

6Capex timing$82K staged

Stage the $82,000 capex plan across the launch months instead of buying everything upfront, so equipment and software spend do not outrun confirmed orders.