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Home/Services/Tax Preparation/Business Returns
1120 C-Corp · 1120-S S-Corp · 1065 Partnership · White-label · Reviewer-ready

Outsource business entity tax return preparation — C-Corps, S-Corps, and partnerships handled by certified offshore accountants.

Business returns are more complex than individual returns and more time-intensive for your CPAs to prepare from scratch. We handle the preparation work for 1120, 1120-S, and 1065 returns — your CPAs review, apply judgment, and sign. That's the division of labour that lets your firm serve more business clients without adding local headcount. We also prepare nonprofit 990 returns.

Outsource business returns Tax season capacity →
Entity types covered

The three business entity return types that cover the majority of small business CPA firm clients.

1120
C Corporation
C-Corp tax return preparation
Full Form 1120 preparation for C corporations. Schedule M-1 and M-3 reconciliation, depreciation schedules, net operating loss tracking, and estimated tax payment calculations.
Schedule M-1/M-3 book-to-tax reconciliation
Depreciation and amortisation schedules
Net operating loss carryforward tracking
Dividends received deduction
Estimated tax payment schedule
See full C Corporationdetail →
1120-S
S Corporation
S-Corp tax return preparation
Full Form 1120-S preparation with Schedule K-1 for each shareholder. Built-in gains tax calculations, AAA and OAA tracking, and reasonable compensation analysis support.
Schedule K-1 for all shareholders
AAA and OAA account tracking
Built-in gains tax calculations
Shareholder basis schedule maintenance
Reasonable compensation documentation support
See full S Corporationdetail →
1065
Partnership / LLC
Partnership and LLC tax return preparation
Full Form 1065 preparation for general and limited partnerships and multi-member LLCs. Schedule K-1 for all partners, capital account maintenance, and basis calculations.
Schedule K-1 for all partners/members
Partner capital account maintenance
Outside basis schedule preparation
Section 754 election support
Guaranteed payment tracking
See full Partnership / LLCdetail →
Quality process

Business returns require more preparation time and more precise judgment. Our process reflects that.

A 1065 with 8 partners, carried interest, and a Section 754 election in effect is not prepared the same way as a simple S-corp return. Our accountants understand entity-specific complexity — and flag items requiring your professional judgment clearly, so your review is efficient rather than exhaustive.

Prior year return reviewed before work begins
Every business return engagement starts with a review of the prior year return. Carryforwards identified, elections confirmed, and any changes in the client’s situation noted before preparation starts.
K-1 allocation review before issuance
For all pass-through entities, K-1 allocations are verified against the operating agreement or shareholder agreement before the K-1s are prepared. Allocation errors are among the most common and most consequential errors in business return preparation.
Book-to-tax reconciliation completed as standard
Schedule M-1 or M-3 reconciliation prepared for every corporate return. Temporary and permanent differences identified and documented. This step is where most preparation errors are caught.
Judgment items flagged — not silently resolved
Any item requiring CPA-level judgment — treatment of a related-party transaction, an ambiguous deduction, an entity classification question — is flagged in a preparer note for your attention. We prepare. You judge. Nothing is resolved silently.
Related pages
Service
Full tax preparation — all return types including 1040 and 990
C-Corp
C-Corp 1120 return preparation — book-to-tax, M-1/M-3, Schedule L
S-Corp
S-Corp 1120-S return preparation — K-1s, AAA tracking, basis
Partnership
Partnership & LLC 1065 preparation — K-1s, capital accounts, 754
Trust
Trust & Estate 1041 preparation — DNI, beneficiary K-1s
Capacity
Tax season capacity — set up before December

Business returns prepared correctly. Ready for your review.

Tell us your entity mix — 1120, 1120-S, 1065 — and the software you use. We'll confirm coverage and tell you what the first batch looks like.

Book a discovery call

Or email us directly at accounting@nimblechapps.finance — no forms, no bots.