Startups
Startup accounting breaks fast without a system built for it. Maspartner provides outsourced accounting for startups, GAAP compliant bookkeeping, and IRS filings built specifically for venture backed startups.
About Startup Accounting and Advisory
Startup accounting is bookkeeping built for a business that changes shape every few months. A startup's chart of accounts, expense categories, and reporting cadence at formation look nothing like what's needed six months after a seed round, and most in-house bookkeeping setups can't keep pace with that rate of change. Founders need GAAP compliant books from day one, since messy accounting discovered during investor due diligence can delay or derail a raise, and IRS filing requirements, from quarterly estimated taxes to R&D credit documentation, pile up fast for a team focused on building product.
Maspartner provides outsourced accounting and bookkeeping services to founders building their first startup, venture backed companies preparing for a raise, and growth stage businesses formalizing their books, supporting teams on QuickBooks, Xero, or NetSuite alongside tools like Carta, Gusto, and Brex. Our bookkeeping team handles equity accounting, GAAP compliant financial statements, and IRS filings as part of everyday startup accounting, not as a specialized add on.
Services We Offer
Bookkeeping system setup, chart of accounts
Financial forecasts, budgets
Revenue and expense projections
Break even analysis
Investor ready financial models
GAAP compliant financial statements
Entity accounting: LLC, C Corp, NPO
Bookkeeping for business, tax registrations
Ongoing IRS and state tax compliance
Cap table accounting, bookkeeping
Equity compensation accounting
ESOP accounting, valuation, taxation
Monthly bookkeeping, account reconciliation
Payroll accounting
ERP, CRM bookkeeping integration
Ongoing accounting and IRS compliance
Investor financial reporting
AP and AR bookkeeping management
The Problems We Solve for Startups
Books That Don't Follow GAAP Slow Down Fundraising
We maintain GAAP compliant bookkeeping from day one, so financial statements are investor ready whenever a round comes together.
Equity Transactions Don't Get Recorded in the Books Correctly
We record every equity transaction in the bookkeeping system as it happens, so the general ledger and the cap table always agree.
IRS Filing Deadlines Get Missed While Building Product
We manage the startup’s IRS filing calendar as part of ongoing startup accounting, so nothing slips while the team focuses on building.
R&D Tax Credit Documentation Never Gets Built Into the Books
We structure the chart of accounts to capture R&D eligible costs as they’re recorded, so the credit is fully documented and ready to file.
Franchise and Annual State Fees Get Miscalculated in the Books
We handle franchise and annual fee accounting and filing across every state of incorporation, calculating the correct method before filing.
Benefits of Outsourcing Accounting Services
GAAP Compliant Books, Always
IRS Compliance Without the Scramble
More Time for What Matters
Bookkeeping That Scales with Funding
One Accounting Partner Across Every Stage
Beyond offering services, we complement your journey with our commitment to Satisfaction
Why Mercurius?
100+ Ratings on Google
Experience the services that’s earned us top ratings.

In-house Remote Bookkeepers
Our professionals are highly qualified and experienced in diverse bookkeeping practices.

Technology-Driven
Technology-Driven Utilize the latest bookkeeping software and tools for accurate and efficient financial management.

Strong Industry Expertise
Our experience across various industries enables us to have a better understanding of your business’s unique challenges and requirements.

Tailored Solutions
We offer customized bookkeeping services that align perfectly with your business needs.
Software Expertise
Other Industries We Serve
Mercurius delivers precise financial solutions backed by industry expertise, ensuring accurate and reliable results across all sectors.

Ecommerce and Retail

Accounting, Tax and CPAs

Law firms and Attorneys

Real Estate and Construction

Education and Coaching

IT and SaaS
Client Testimonials
Great work – love the dedicated member of the team that is assigned to work on my account.
Graham Blair
Habitat Seven Inc 🇨🇦
Manvi and the team at Mercurius are excellent. We have been working with them for a number of years and they have been pivotal in keeping our accounts in good order.
Cameron Kincaid
Chemeyes Ltd 🇬🇧
Siddhartha is delightful to work with and always completes assignments ahead of schedule and with no iteration needed.
Mike Schoenfeld
MBS Consulting🇺🇸
Pleasant to work with, knowledgeable on accounting principles, responsive
Christine Atieno
Keys Please Homes🇺🇸
Sid and his team so excellent work – on time and very attentive to detail.
Joel Cape
Joel E Cape, PLC🇺🇸
Seeking custom services?
Drop your email, and we’ll get in touch, or contact us directly.
Startups We Work With
PRE SEED STARTUPS | SEED STAGE STARTUPS | SERIES A AND BEYOND | BOOTSTRAPPED FOUNDERS SAAS STARTUPS | CONSUMER STARTUPS | FINTECH STARTUPS | DEEP TECH STARTUPS FOUNDER LED BUSINESSES | VENTURE BACKED COMPANIES | NONPROFIT STARTUPS | FIRST TIME FOUNDERS
FAQs
Why do investors care whether my startup's books follow GAAP?
Investors use GAAP compliant financial statements as the baseline for evaluating a startup’s actual financial position during due diligence, and books kept on a cash basis or without consistent accounting standards often require a full rebuild before a round can close. Startups that maintain GAAP compliant bookkeeping and disciplined startup accounting from formation avoid that scramble entirely.
How does outsourced accounting handle SAFE notes and equity on the books?
SAFE notes and other convertible instruments need to be recorded on the balance sheet according to their accounting treatment as of each reporting period, then reclassified correctly at conversion, which is different from how they appear on a cap table tool. Outsourced startup accounting teams reconcile the bookkeeping records against the cap table regularly, so both stay accurate through every funding event.
What IRS filings does a startup need to stay on top of?
Depending on entity type and payroll status, a startup typically needs to manage quarterly estimated tax payments, payroll tax deposits and filings, annual federal and state tax returns, and information returns for equity or contractor payments. Missing any of these triggers IRS penalties that compound the longer they go unaddressed, which is why ongoing bookkeeping needs to include a filing calendar, not just transaction recording.
Can my startup claim the R&D tax credit even before generating revenue?
Yes, qualified small businesses under a certain revenue threshold can apply the federal R&D credit against payroll tax liability instead of income tax, making it valuable even for pre-revenue startups. Claiming it requires startup accounting and bookkeeping records that separate qualifying research and development costs from general expenses throughout the year, not just at tax filing time.
Can outsourced accountants help prepare financials for a fundraising round?
Yes. Startup focused outsourced accounting teams build GAAP compliant financial statements, clean up historical bookkeeping records, and prepare the documentation investors typically request during diligence, working alongside founders rather than handing over a template to fill in. Fundraising readiness is where disciplined startup accounting shows its value.
Our Case Studies
Enhancing Bookkeeping and Financial Reporting for a U.S. Recreational Boating Business
INTRODUCTION A U.S.-based recreational boating business specializing in personalized sailing lessons, motorboat instruction, private charters,…
INTRODUCTION A U.S.-based law firm specializing in estate planning, elder law, and charitable planning engaged…
INTRODUCTION In late 2022, a U.S.-based business operating in the real estate rental industry engaged our firm…
INTRODUCTION In October 2019, a U.S.-based real estate investor engaged our firm to support the…
Strengthening Financial Accuracy Across Bookkeeping Processes
INTRODUCTION In April 2021, a U.S.-based business in the retail trade of medical equipment approached…
Streamlining Financial Operations and Invoicing for Scalable Growth
INTRODUCTION In March 2024, a U.S.-based clean energy company approached us for professional bookkeeping support.…
Restoring Financial Accuracy Across Multi-Entity Accounting
INTRODUCTION A rapidly growing communications company headquartered in New York supports brands and organizations in…
Restoring Financial Accuracy in QuickBooks Online
INTRODUCTION A growing business managing vehicle rentals and a Shopify-based equipment store approached us for…
Streamlining Bank Reconciliations in Cetec ERP
INTRODUCTION A business maintaining its bookkeeping records in Cetec ERP approached us for support with…
Restoring Accuracy Through Comprehensive Record Cleanup
INTRODUCTION A finance and investment firm with multiple accounts and a high volume of transactions…






