Industries
CPA Services for Engineering Firms
Engineering firms carry an accounting requirement most service businesses never meet: the rate at which indirect cost is loaded onto a job is not only a management figure. On public work it is calculated to a prescribed standard, submitted, and sometimes examined — so the books have to be built to support it from the first entry, not assembled to match it afterwards.
Job cost accounting is the foundation, not a report
Every hour, not just the billable ones
An indirect rate is direct labor on one side and everything else on the other. That arithmetic only works if time is captured against a job code for all hours worked — including proposals, training, administration and leave. Timekeeping designed to produce invoices routinely fails this, because it stops recording once an hour is known to be unbillable, and the missing hours quietly distort the rate in both directions.
Costs that are not allowed to be in the pool
Firms working for public agencies develop their indirect rate under the federal cost principles, which exclude categories of cost outright — entertainment, certain advertising, some interest and owner compensation above what the work supports. Those exclusions are far easier to apply if the chart of accounts separates them all year than if they are dug back out of general ledger detail in the spring.
Where our work stops
Above certain thresholds, agencies including the state department of transportation require the overhead rate to be examined by a CPA firm. We do not perform attest engagements of any kind. What we can do is get the underlying accounting into a state where that examination is straightforward, and work alongside the firm that performs it. Being told this at the start is more useful than being told it in June.
Contracts, subconsultants and getting paid
Prime and sub are different businesses on paper
Carrying subconsultants as prime runs their fees through your revenue. Profit is unchanged; gross receipts are not, and gross receipts decide method-of-accounting eligibility, feed state apportionment formulas and sit behind several other tests. It also puts information reporting for every sub on your side of the ledger.
Retainage and public payment cycles
Money earned and held back is income to an accrual-method firm before it is cash in the account, which is how a profitable year and a difficult year can be the same year. Estimated payments have to be planned against the income figure rather than the bank balance, and a line of credit priced before the crunch is cheaper than one arranged during it.
Staff who work in other states
A firm's own filing obligations follow its projects, but employees create a second, separate problem: a state generally expects income tax withheld for work physically performed inside it, and the thresholds for that are low and inconsistent between states. A survey crew or a resident engineer on a site across a state line can trigger registration, withholding and quarterly filings that nobody at the firm has been asked about. The fix is a rule for tracking days on site, applied while the project runs.
Field equipment, vehicles and software
Survey instruments, testing and monitoring equipment, drones and field trucks are all capital decisions with a timing choice attached, and the choice between mileage and actual cost on a vehicle is made per vehicle and is not freely reversible later. What makes any of it hold up is contemporaneous records — miles, fuel, repairs, personal use — kept during the year. Software is the mirror image: perpetual licenses, subscriptions and internally developed tools are not deducted on the same schedule as each other.
Research credit claims, and the contract that decides them
Engineering firms hear the same cold calls architects do, and for engineering work the answer usually turns on the contract rather than on the technical merit. Where the client pays regardless of whether the technical objective is met, the research is funded by them and the credit generally is not yours; where you carry the risk and retain rights in the result, there may be a claim. Any claim needs project-level and employee-level records made while the work happens. We will look at it honestly and tell you when it is not there.
Where this fits with the rest of the practice
- Business Tax — entity returns, multi-state filings and compliance.
- Bookkeeping Services — job cost records, the monthly close and the indirect cost pool.
- Tax Planning & Advisory — equipment timing, entity choice and estimated payments.
- Personal Tax — the owners' returns, prepared alongside the firm's.
The services behind this
Business Tax
Year-round planning, corporate returns, pass-through entities and multi-state compliance.
Learn moreBookkeeping Services
Clean books, reconciled monthly, ready for tax time.
Learn moreTax Planning & Advisory
The plan that ties entity choice, timing, property and exit decisions together.
Learn morePersonal Tax
1040 preparation, tax-saving strategy, and multi-state or expatriate filings.
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Engineering Firms: common questions
Job cost, indirect rates for public work, retainage and multi-state staff.
Why does my indirect cost rate depend on how we keep time?
Because the rate is direct labor on one side and everything else on the other, and that only works if every hour is recorded against a code, including proposals, training, administration and leave. Timekeeping built to produce invoices usually stops recording once an hour is unbillable, which distorts the rate. Engineering firms.
What costs have to come out of the overhead pool for public work?
Firms working for public agencies build the rate under the federal cost principles, which exclude categories outright, including entertainment, certain advertising, some interest and owner compensation above what the work supports. Separating them in the chart of accounts all year is far easier than digging them out in the spring. Engineering firms.
Can you audit our overhead rate for the department of transportation?
No. We do not perform attest engagements of any kind. What we can do is get the underlying accounting into a state where that examination is straightforward and work alongside the firm that performs it. Being told this in January is more useful than in June. Engineering firms.
Does carrying subconsultants as prime change my taxes?
Not the profit, but it raises gross receipts, and gross receipts decides method-of-accounting eligibility, feeds apportionment formulas and sits behind several other tests. It also moves information reporting for every sub onto your side of the ledger.
Is retainage income before I receive it?
On the accrual method, generally yes, which is how a profitable year and a difficult cash year can be the same year. Estimated payments have to follow the income figure rather than the bank balance. Deadlines and estimated payments.
My crew worked three weeks in another state. Does that create a filing?
Possibly two: the firm's own return there, and state income tax withholding for the employees who were physically working in it. Withholding thresholds are low and inconsistent between states, so the practical fix is a rule for tracking days on site while the project runs. Engineering firms.
How do I handle survey and testing equipment for tax?
As capital purchases with a timing choice attached, the same as any equipment. For vehicles, the mileage-versus-actual choice is made per vehicle and is not freely reversible, and what makes either hold up is records kept during the year rather than reconstructed after it.
Is internally developed software deducted the same way as a subscription?
No. Subscriptions, perpetual licenses and software the firm develops for its own use are each on a different footing, and for a firm building its own tools the treatment has moved in recent years, so the current rule governs.
Does my engineering firm qualify for the research credit?
It usually turns on the contract rather than the technical merit. Where the client pays regardless of whether the objective is met, the research is funded by them and the credit generally is not yours; where you carry the risk and keep rights in the result, there may be a claim. Either way it needs project-level and employee-level records made as the work happens. Engineering firms.
What entity should an engineering firm use in South Carolina?
The usual analysis, plus the professional entity rules that constrain ownership of a licensed practice. Entity choice changes owner compensation, self-employment tax and how state filings work across the states you operate in. Entity choice.
Can you take over our books as well as the tax return?
Yes, including job cost records and the monthly close. We do not process payroll and do not perform attest work, so we will tell you at the start which pieces need somebody else. Bookkeeping services.
When should I call about a project in another state?
Before the contract is signed, ideally. Registrations, withholding and apportionment are all cheap to set up in advance and expensive to correct once several years of returns are on the wrong basis. Book a consultation.
Next steps
- Schedule a consultationWhat the first conversation covers, and what is worth having to hand.Go
- CPA services in CharlestonThe James Island office, and what South Carolina changes.Go
- Documents to bringA checklist for the first conversation, so the second is about answers.Go
- Frequently asked questionsEngagement, service area, deadlines, documents and IRS notices.Go
Talk to a tax expert
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