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Accounting and Bookkeeping for

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.

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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

We maintain GAAP compliant bookkeeping from day one, so financial statements are investor ready whenever a round comes together. 

We record every equity transaction in the bookkeeping system as it happens, so the general ledger and the cap table always agree. 

We manage the startup’s IRS filing calendar as part of ongoing startup accounting, so nothing slips while the team focuses on building.

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. 

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

Financial statements built to hold up under investor due diligence.

IRS Compliance Without the Scramble

Filing deadlines get tracked and met as part of ongoing bookkeeping.

More Time for What Matters

Outsourced startup accounting frees up founder hours for product and growth.

Bookkeeping That Scales with Funding

Accounting systems that hold up through every future round.

One Accounting Partner Across Every Stage

Bookkeeping, tax filing, and reporting from one team, not several vendors.

Why Clients Choose Us?

Beyond offering services, we complement your journey with our commitment to Satisfaction

Why Mercurius?

4.7
Rated 4.8 out of 5

100+ Ratings on Google

Experience the services that’s earned us top ratings.

Understanding UK taxation rates and compliance requirements. | NetSuite accounting

In-house Remote Bookkeepers

Our professionals are highly qualified and experienced in diverse bookkeeping practices.

Expert UK taxation advice for individuals and businesses.

Technology-Driven

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

UK taxation services with expert filing support from Maspartner. | canada company formation | uae vat

Strong Industry Expertise

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

UK taxation services with expert filing support from Maspartner. | canada company formation | uae vat

Tailored Solutions

We offer customized bookkeeping services that align perfectly with your business needs.

Software Expertise

Industries We Serve

Other Industries We Serve

Mercurius delivers precise financial solutions backed by industry expertise, ensuring accurate and reliable results across all sectors.

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Ecommerce and Retail

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Accounting, Tax and CPAs

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Law firms and Attorneys

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Real Estate and Construction

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Education and Coaching

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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

    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.

    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.

    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.

    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.

    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.

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