Central Jersey · Mercer County
Bookkeeping for Mercer County, NJ small businesses
MCC Solutions keeps the books for small businesses across Mercer County: monthly bookkeeping, catch-up cleanup, payroll and New Jersey filing support, online in the accounting software you own.
Gold tier in Intuit's ProAdvisor program. See my Intuit listing
Matthew Coleman, QuickBooks ProAdvisor, accounting and finance degree. Cranford, NJ. Start with a free health check of your books. You get a quote after we review your books, before any work starts.
Mercer County businesses
Who we work with here
The county seat is Trenton. Businesses we see across the county include state government related consultants and contractors in Trenton, research and professional firms around Princeton, restaurants and retail, and trades.
Mercer County has many consultants and contractors who sell to larger organizations, so clean invoicing, 1099 matching and cash flow tracking are the main jobs.
What we handle
- Monthly bookkeeping and bank and card reconciliation
- Cleanup when the books are months behind
- Monthly profit and loss and balance sheet
- Payroll and New Jersey filing support, as an add-on
- Sales tax and annual report reminders
Local facts
Mercer County at a glance
- Population
- 387,340 (2020 census)
- County seat
- Trenton, which is also the state capital
- Largest municipalities
- Hamilton Township (92,297 in 2020) by population and Hopewell Township by area
- Schools
- Princeton University, Rider University, The College of New Jersey, Thomas Edison State University and Mercer County Community College
- Economy
- A 2021 gross domestic product of $36.0 billion, seventh in the state; Trenton's role as state capital contributes significantly
- Income
- Median household income was $83,306 in the 2020 census
Source: Wikipedia, Mercer County, New Jersey, read October 2026. Figures change and describe the county, not our clients.
Mercer County at a glance
Mercer County by the numbers
Mercer County had about 387,340 residents in the April 1, 2020 estimates base, 12th of New Jersey's 21 counties and about 4.2% of the state's 9,288,994 people. That makes it a mid-sized county by New Jersey standards.
Owners here range from solo operators to firms with a few employees, and the bookkeeping needs vary just as much.
Source: NJ Department of Labor and Workforce Development, county population estimates.
Bookkeeping notes
What the books look like for Mercer County businesses like these
Tech, research and startup businesses
Subscription and contract revenue is recorded in the period it is earned, contractor and payroll costs are separated, software and cloud spending is tracked by vendor, and investor or loan money is kept off the income line.
General bookkeeping practice, not tax or legal advice.
Beyond the books
Beyond the books: fractional CFO support
Once the books are current, the useful questions change. Can Mercer County owners afford the next hire, the new truck or the second location, and what will the bank want to see first? That is financial planning, and it only works on accurate records.
It is planning and reporting on the books we keep, delivered at the size your business needs. It does not replace your CPA. Tax returns are a separate service (see /tax-preparation); we do not audit statements or give legal advice.
What that can include
- Financial statements and a package built for a bank or lender
- Loan, line of credit and payoff scenarios
- A budget and a monthly look at budget versus actual
New Jersey items
What Mercer County businesses deal with
Sales tax, quarterly payroll reports, the annual report and 1099-NEC forms are the same statewide. See the list.
How it works
Online, in accounting software you own, so distance is not a problem. We have no office outside Cranford, and we are happy to talk about meeting in person. You give us access to the file and your bank and card feeds, and each month you get reports and a person to ask.
Where in Mercer County
Towns we serve
Trenton, Princeton, Hamilton, Ewing, Lawrence, West Windsor, Robbinsville, Hopewell, East Windsor, Hightstown, and Pennington, and the rest of the county.
City pages:
ZIP codes we serve in Mercer County
08512 Cranbury, 08520 Hightstown, 08525 Hopewell, 08534 Pennington, 08540 Princeton, 08542 Princeton, 08550 Princeton Junction, 08560 Titusville, 08608 Trenton, 08609 Trenton, 08610 Trenton, 08611 Trenton, 08618 Trenton, 08619 Trenton, 08620 Trenton, 08628 Trenton, 08629 Trenton, 08638 Trenton, 08648 Lawrence Township, 08690 Trenton, 08691 Robbinsville
Bookkeeping is done online, so every ZIP code in the county is in range, and the price is the same.
FAQ
Mercer County bookkeeping questions
Do you work with Mercer County businesses?
Yes. Everything is online, in accounting software you own, so the distance from Cranford to Trenton does not matter. We have no office in Mercer County.
What do consultants and professional firms need from their books?
Invoices are matched to payments so open receivables are accurate, client retainers and expenses are kept apart, and owner pay is recorded the same way every month. Monthly reports show real profit after the owner's own costs.
How do contractors keep job costs straight?
Materials, subcontractors and labor are coded to the job, so each job's margin is visible before the next bid. Deposits and progress billings are recorded as they happen, and 1099 details for subcontractors are collected up front.
Do you handle New Jersey payroll and sales tax for Mercer County businesses?
We can prepare and file New Jersey payroll reports and sales tax filings as an add-on, along with annual report and renewal reminders. Government fees are extra, and we confirm your filing schedule on your own state account first.
How much does it cost?
Monthly bookkeeping starts at $450 for the smallest tier and rises with transaction volume. The bookkeeping page has a live estimate, and we confirm a written quote before starting.
Neighboring counties
All New Jersey counties · Northeast · Bookkeeping by software · Bookkeeping guides · Pricing
Mercer County property taxes
Property tax figures for Mercer County owners and landlords
For a business that owns its space or a landlord with rentals in Mercer County, the municipality matters. The State's 2025 figures across the county's 12 municipalities:
- General tax rate range
- 2.733 in Princeton to 5.890 in Trenton City per $100 of assessed value (a spread of 3.157)
- Average residential tax bill
- $3,793 in Trenton City to $23,373 in Princeton; the middle town is $12,167
- Assessments compared with market value
- town average ratios from 53.53% (Trenton City) to 73.8% (Lawrence Township); 12 of 12 towns are under 85%
- Appeals
- Mercer County Board of Taxation, Mercer County Administration Building, 640 S. Broad St., Rm. 317, Trenton, NJ 08611, (609) 989-6704. Deadline: April 1, or May 1 after a town-wide revaluation or reassessment. Property assessed over $1,000,000 may go straight to the Tax Court.
A ratio well under 100% means assessments there sit below market value, so the general rate looks higher than the real burden; compare towns by the effective rate. Budget with your own bill, not these averages. Estimate a bill.
Sources for the Mercer County figures: NJ Division of Taxation, 2025 General Tax Rates; 2025 Average Residential Statistics; Amended Table of Equalized Valuations 2025; NJ Division of Taxation, county boards (September 2026); NJ Division of Taxation, appeals. Checked November 2026. Call a Mercer County office before you go; rooms and extensions change.