Can an Indian CA firm prepare extension return workpapers for a US CPA?

Yes. An Indian CA firm prepares all workpapers for extended S-corp (1120-S), partnership (1065), and individual (1040) returns — reconciling the client's QuickBooks file, preparing schedules, and delivering clean workpapers overnight. The CPA reviews, signs, and files. The Indian firm has no PTIN and is never the preparer of record.

What is the September 15 tax deadline for CPA firms?

September 15 is the extended deadline for S-corporation returns (Form 1120-S) and partnership returns (Form 1065) that were placed on extension in March. These entities filed a 6-month extension in March, pushing the original March 15 deadline to September 15. CPA firms with heavy S-corp and partnership client bases face a concentrated workload in the two weeks before September 15.

How long do Indian CA workpapers take for extension returns?

For a client with up-to-date books: overnight — work submitted at 5 PM Eastern returns by 9 AM the next morning. For a client who has not maintained books through the year and needs catch-up: three to five business days depending on transaction volume. The September-to-October window gives most CPA firms enough lead time to batch extension returns to the Indian team.

Do I need IRC 7216 consent for extension return clients?

Yes. IRC Section 7216 consent is required before sharing any client tax data with a third party — including extension return clients. If you embedded the consent form in your engagement letter at the start of the year, clients have already signed it and no further action is needed. If not, a standalone consent form must be signed before any files are shared with the Indian firm.

How many US individual tax returns are typically filed on extension?

Approximately 15–19 million US individual returns are filed on extension each year — roughly 13% of all returns. For a CPA practice, the proportion is often higher: clients with complex financial situations (rental properties, S-corp K-1s, brokerage accounts) are more likely to request extensions because their documents arrive late. A practice with 200 individual clients may have 40–60 extension returns due October 15.

Extension Season Outsourcing to India

Why Extension Season Is the Most Underserved CPA Capacity Problem

Most discussions about CPA capacity focus on April 15. Extension season — the six-week window from early September through October 15 — receives far less attention, yet it creates an identical capacity problem for many practices. The difference is that extension season is completely predictable and entirely preventable with the right offshore support structure.

A typical CPA practice with a mixed client base will have 30–50% of its S-corp and partnership clients on extension, plus 10–15% of individual clients. That is not a small tail — it is a second season. And because extension clients are disproportionately complex (they filed extensions precisely because their situations are more involved), the workpaper preparation work per return is heavier than the April average.

Indian CA support solves this the same way it solves April: overnight workpaper preparation at $6–$15/hr, with the CPA doing only what requires a US CPA license — reviewing, applying tax law judgment, signing, and filing.

The September 15 Deadline — S-Corp and Partnership Returns

September 15 is the extended deadline for two entity types that dominate small business CPA practices:

S-corporations (Form 1120-S): Originally due March 15, extended six months to September 15. Every S-corp shareholder needs a K-1 before they can file their personal return — which means S-corp returns that miss September 15 cascade into delayed individual returns for every shareholder.
Partnerships (Form 1065): Also originally due March 15, extended to September 15. Like S-corps, each partner needs a K-1 before their 1040 can be completed. A single partnership with four partners creates four delayed individual returns if the partnership misses the deadline.

For a CPA firm with 30 S-corp and partnership clients on extension, September is nearly as concentrated as March. Indian CA teams handle the bookkeeping and workpaper preparation — reconciling the entity's QuickBooks, preparing the income and expense schedule, organizing K-1 allocation workpapers — and deliver overnight so the CPA can review and file in the two weeks before September 15.

The October 15 Deadline — Individual Extension Returns

October 15 is the extended deadline for individual returns (Form 1040) that received an automatic six-month extension from April 15. The IRS processes roughly 15–19 million extension returns each year. For CPA practices, the proportion of clients on extension is typically higher than the national average because complex clients — those with rental properties, S-corp K-1s, significant capital gains, or late-arriving brokerage statements — are more likely to need extra time.

The October 15 crunch has one characteristic that makes it particularly suitable for Indian CA support: the September-to-October window gives the CPA time to batch extension returns to the Indian team rather than processing them day by day under pressure. A CPA who sends 15 extension return files to the Indian team in the first week of September can expect workpapers back within one to three business days per return — leaving October for review and filing rather than preparation.

Common extension return profiles well-suited for Indian CA workpaper preparation:

Clients with rental properties whose final expense figures were not available by April
Clients with S-corp or partnership K-1s that were themselves extended to September 15
Clients with complex capital gains from brokerage accounts or real estate sales
Clients whose sole proprietor business books were not reconciled by April
Clients who requested extensions due to life events — divorce, inheritance, business sale

What an Indian CA Team Prepares for Extension Returns

The workpaper scope for extension returns is identical to the April scope — extension filing status does not change what needs to be prepared. The Indian CA team handles everything before the CPA opens Drake, UltraTax, Lacerte, or ProSeries.

Return Type	Indian CA Prepares	CPA Does
Form 1120-S (S-corp)	QuickBooks reconciliation, P&L, balance sheet, K-1 allocation workpapers by shareholder percentage	Tax law elections, built-in gains analysis, sign and file
Form 1065 (Partnership)	QuickBooks reconciliation, P&L, balance sheet, partner capital accounts, K-1 allocation workpapers	Section 754 elections, guaranteed payment treatment, sign and file
Form 1040 (Individual extension)	QuickBooks reconciliation, Schedule C/D/E, Form 8949, W-2 and 1099 organization, estimated tax summary	Filing status decisions, tax law elections, Section 199A deduction calc, sign and file
Rental property schedules	Property-by-property income and expense, depreciation schedule, passive loss tracking	Passive activity rules application, at-risk limitation review
K-1 pass-through organization	All K-1s received extracted and mapped to correct Schedule E lines with prior-year carryforwards noted	Basis tracking, at-risk rules, final return judgment calls

How the Overnight Model Works in Extension Season

The time zone difference between India and the United States — 10.5 to 13.5 hours depending on the US time zone — means that work submitted at the end of a US business day is processed during India's following business day and returned before the US CPA starts work the next morning.

For extension season, the practical workflow is:

Week 1–2 of September: CPA sends S-corp and partnership extension files — QuickBooks access or exported file, prior-year return, any relevant documents. Indian team begins workpaper preparation.
Overnight turnaround: For a client with clean year-round books, workpapers return the next morning. For a client needing full-year catch-up bookkeeping, allow three to five business days.
CPA reviews and files S-corps and partnerships by September 15. K-1s are delivered to shareholders.
September 15–October 10: Individual extension files are sent to the Indian team in batches. Workpapers return overnight.
CPA reviews and files individual extensions by October 15.

The key advantage of this structure: the CPA is doing review and filing work throughout September and October, not preparation work. Review of a clean workpaper package takes 30–60 minutes. Preparation of the same package from scratch takes three to six hours. Over 40 extension returns, that difference is 100–200 hours of CPA time recaptured.

Cost Comparison — Extension Season Indian CA Support vs Alternatives

Option	Hourly Rate	Per Return (avg 5 hrs prep)	40 Extension Returns
CPA self-preparation	$150–$250 opportunity cost	$750–$1,250	$30,000–$50,000 in CPA time
US seasonal hire (part-time)	$35–$55/hr	$175–$275	$7,000–$11,000
Sharma Jyoti and Co (Indian CA)	$6–$15/hr	$30–$75	$1,200–$3,000

For 40 extension returns, Indian CA support costs $1,200–$3,000 for the full preparation workload. A US seasonal hire for the same work costs $7,000–$11,000 — and requires onboarding, training, and a commitment that may not align with a six-week seasonal need. Indian CA support scales to the exact volume needed with no fixed overhead.

Setting Up Indian CA Support Before Extension Season Starts

The worst time to start onboarding an Indian CA firm is the first week of September. Lead time for a smooth first engagement is two to four weeks — enough time to complete the NDA and Data Processing Agreement, do a test run on one or two non-time-sensitive returns, and establish the file transfer workflow before the deadline pressure begins.

CPA firms that use Indian CA support year-round have the simplest extension season: the relationship and workflow are already established from April. For firms that only need surge capacity, August is the right time to initiate the relationship — before clients start calling about their September deadlines.

Steps to prepare before extension season:

Confirm IRC Section 7216 consent is in place for all extension clients — embedded in engagement letters signed at year start covers most clients
Sign NDA and Data Processing Agreement with the Indian firm
Establish secure file transfer method — encrypted email, ShareFile, or a shared cloud folder with access controls
Run a trial return on a non-time-sensitive client to validate workpaper quality and turnaround time
Create a simple briefing template: client name, return type, QuickBooks file or access credentials, prior-year return, any specific notes or issues

About This Article
Written by Sharma Jyoti, CA (ICAI) — Founder, Sharma Jyoti and Co. We are an ICAI-registered Chartered Accountant firm providing extension season workpaper support to US CPA firms. Learn more about our firm →

Frequently Asked Questions

Yes. An Indian CA firm prepares all workpapers for extended S-corp (1120-S), partnership (1065), and individual (1040) returns — QuickBooks reconciliation, income and expense schedules, K-1 allocation workpapers, and Schedule C/D/E detail. The CPA reviews, signs, and files. The Indian firm has no PTIN and is never the preparer of record.

September 15 is the extended deadline for S-corporation returns (Form 1120-S) and partnership returns (Form 1065) that were placed on automatic extension in March. These entities originally had a March 15 deadline. Missing September 15 cascades into delayed K-1s for shareholders and partners, which in turn delays their individual returns due October 15.

For a client with up-to-date books: overnight — work submitted at 5 PM Eastern returns by 9 AM the next morning. For a client needing catch-up bookkeeping for the full year: three to five business days depending on transaction volume. The September-to-October window gives most CPA firms enough lead time to batch extension returns to the Indian team ahead of the deadline.

Yes. IRC Section 7216 consent is required before sharing any client tax data with a third party, including extension return clients. If you embedded the consent in your engagement letter at year start, clients have already signed it — no additional action needed. If not, a standalone consent form must be signed before any files are shared with the Indian firm.

August is the right time — two to four weeks before September extension work begins. This allows time to complete the NDA and Data Processing Agreement, do a test run on a non-time-sensitive return, and establish the file transfer workflow before deadline pressure starts. Starting in the first week of September is too late for smooth onboarding.

How US CPAs Use India for Extension Season (Sep–Oct Deadlines)