Electronic Components Break-Even Analysis: About $30K Monthly Sales

Fixed costs $7.5K/mo Base overhead

Contribution margin 80% After variable costs

Break-even revenue $9.4K/mo Monthly target

Break-even timing Month 13 Forecast break-even

Break-even calculator

Test whether monthly revenue covers variable expenses and the fixed cost base needed to break even.

Lean Base Full

Monthly revenue Revenue is the monthly cash in before direct costs. $ Slow month Strong month Variable expenses These rise with sales, like component costs, shipping, and payment fees. $ Light costs Heavy costs

Money available to cover fixed costs $20,000 $25,000 revenue - $5,000 variable expenses

Margin ratio

80%

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 expenses are fixed and which move with sales for this electronic components business?

Cost classification

Break-even is reliable only when monthly overhead stays fixed and order-linked charges move with sales. Here, Month 13 break-even can be overstated if the $40,000 opening inventory buy is treated as recurring overhead.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse Lease	Fixed	Use $3,500 per month in fixed overhead from Month 1 through Month 60.	Spreading rent across units and making break-even look better when volume rises.
Platform Hosting & Licenses	Fixed	Use $1,200 per month as base platform overhead for the planning range.	Treating hosting as variable even though the model sets a stable monthly charge.
Direct Component Costs	Variable	Apply 12.0% of revenue in the first year, falling to 8.0% by the fifth year.	Treating the $40,000 initial inventory buy as monthly fixed overhead instead of inventory converted into expense as items sell.
Supplier Sourcing Fees	Variable	Apply 1.5% of revenue in the first year, declining to 0.5% by the fifth year.	Ignoring sourcing fees because they look small, which overstates gross margin.
Payment Processing Fees	Variable	Apply 2.5% of revenue in the first year, falling to 1.5% by the fifth year.	Putting card fees in fixed overhead instead of tying them to paid orders.
Shipping Carrier Fees	Variable	Apply 4.0% of revenue in the first year, declining to 2.5% by the fifth year.	Using a flat freight budget and missing the cash drag from higher order volume.
Packing Supplies	Semi-variable	Start with the $400 monthly base, then watch for volume pressure as order count scales.	Leaving it fully fixed when more shipments require more boxes, labels, and inserts.
Warehouse Operations Lead	Semi-fixed	Add the role from Month 13 as a capacity step, not as a per-order charge.	Loading the full role into launch-month overhead and overstating early break-even revenue.

How does break-even shift from a lean launch to a base case and full-scale build?

Scenario table

Lean breaks even near $30k in monthly sales, then the threshold rises to about $57k and $92k as payroll and marketing scale. Higher AOV helps, but fixed costs move faster.

Planning figures based on the model assumptions; they show direction, not a guarantee.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$29.9k	$6.0k	$24.0k	80.0%	$0	Low overhead keeps break-even close to $30k.
Base case	$56.9k	$10.1k	$46.9k	82.3%	$0	Marketing and payroll push the threshold to about $57k.
Full-scale build	$92.3k	$14.6k	$77.7k	84.2%	$0	Better margin helps, but larger fixed costs keep break-even near $92k.

What breaks the break-even plan first if sales slow or costs rise?

Stress test

At $23,958 of fixed monthly costs and an 80% contribution margin, break-even sits near $29,948 of monthly revenue. A 10% sales miss, a 5-point margin hit, or $5,000 more overhead pushes the plan into loss fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	Base case, with $23,958 in monthly fixed costs and an 80% contribution margin.	$29,948	$0 cushion	No cushion if supplier prices or freight rise.
Revenue shortfall	Sales land 10% below the break-even target, or about $26,953.	$29,948	$2,995 gap	A small miss is enough to turn profitable months into losses.
Fixed-cost pressure	Monthly overhead rises by $5,000 to $28,958.	$36,198	$6,250 gap	Extra overhead needs much more sales just to stay even.
Margin pressure	Contribution margin drops 5 points to 75% from freight, fees, or returns.	$31,944	$1,997 gap	Shipping, returns, and write-downs can erase the cushion fast.
Combined pressure	Sales hold near $27,000, margin stays at 75%, and fixed costs rise to $28,958.	$38,611	$11,612 gap	This mix creates about an $8.7k monthly loss.

What should the founder verify before committing to the warehouse, inventory, and hiring plan?

Founder checklist

Before you sign the lease, buy deep inventory, or add staff, confirm the model can still reach Month 13 break-even. If demand, margin, and cash miss the $30K monthly line, the fixed-cost base gets ahead of revenue fast.

1Demand Proof$52 AOV

Validate demand before the $40K initial inventory purchase; Year 1 average order value is about $52, so the first orders must support the mix across microcontrollers, resistor kits, sensor modules, and power supplies.

2Lease Load$3.5K/mo

Hold the warehouse lease and equipment buys until order flow justifies them, because the $3.5K monthly lease and early racking, forklift, and van spend hit before revenue has room.

3Contribution Margin80% CM

Check supplier terms and shipping flow now: Year 1 direct component costs plus sourcing, payment, and carrier fees take 20% of revenue, so contribution margin is about 80%.

4Paid Launch$75K / $28 CAC

Test paid demand against the $75K Year 1 marketing budget and $28 customer acquisition cost, because the channel has to buy customers cheaply enough to feed repeat orders.

5Staff Ramp$30K/mo

Delay the e-commerce manager, warehouse lead, and support hires until monthly revenue stays above $30K, or labor will widen the Month 13 cash gap.

6Cash Cushion$747K

Keep at least $747K available by Month 13, since that is the model's minimum cash point before break-even catches up.