Clear answers. Careful numbers. ST Group on your side.
ST Group is a full-service accounting firm working with businesses, organizations, and individuals — wherever they are. Audit, tax, and advisory, handled with experience and delivered with care.
Helping organizations reach their financial goals
ST Group provides audit, tax, and advisory services to clients near and far — wherever you are, our encrypted client portal makes working together simple and secure. We are a full-service firm serving businesses, organizations, and individuals, with the experience to take on engagements that demand specialized regulatory knowledge.
The promise is simple: experienced work, fair pricing, and direct, personal attention — you always work with someone who knows your file. Your first consultation is always free: bring your questions and you'll get a clear answer on how we can help.
- Service. We return calls promptly, meet every deadline, and take the time to explain things clearly — no jargon, no runaround.
- Expertise. Decades of experience across audit, review, tax, and advisory engagements.
- Integrity. Independent, objective, and accountable — the standards our license demands.
Services
From annual audits to a quick QuickBooks question — one firm, full service.
Services for Individuals
Personal tax preparation and planning that protects what you've earned — deductions and credits fully used, filings done right and on time, and year-round guidance for life's bigger financial decisions.
Business Services
Auditing, review, and compilation services alongside accounting and advisory support — reliable financial statements, clean books, and practical advice for improving margins and cash flow.
Tax Services
Planning, compliance, and preparation for businesses, organizations, and individuals. We work to make sure you never pay more than the law requires — and never less than it demands.
QuickBooks Services
Setup, cleanup, and training for the most widely used small-business accounting software — so your day-to-day bookkeeping produces numbers you and your CPA can actually rely on.
Upcoming tax deadlines
Key federal (IRS) and California (FTB) due dates.
| Date | What's due |
|---|---|
| Sep 15, 2026 | Q3 2026 federal estimated tax payment · Extended S-corporation and partnership returns (Forms 1120-S, 1065) |
| Oct 15, 2026 | Extended individual returns (Form 1040) and extended C-corporation returns · Extended California personal returns |
| Jan 15, 2027 | Q4 2026 federal estimated tax payment · CA Q4 personal estimate |
| Feb 1, 2027 | W-2s and 1099-NEC forms due to recipients and to SSA/IRS (Jan 31 falls on a Sunday) |
| Mar 15, 2027 | S-corporation and partnership returns (or extensions) for the 2026 tax year |
| Apr 15, 2027 | Individual and C-corporation returns (or extensions) · Q1 2027 estimates · 2026 IRA/HSA contribution deadline · CA personal returns, Q1 estimate, and LLC franchise tax |
| Jun 15, 2027 | Q2 2027 federal and CA estimates · CA LLC estimated fee |
| Sep 15, 2027 | Q3 2027 federal estimated tax payment · Extended S-corporation and partnership returns |
| Oct 15, 2027 | Extended individual and C-corporation returns · Extended California personal returns |
| Jan 18, 2028 | Q4 2027 federal estimated tax payment · CA Q4 personal estimate (Jan 15 falls on a weekend and Monday is a federal holiday) |
| Jan 31, 2028 | W-2s and 1099-NEC forms due to recipients and to SSA/IRS |
| Mar 15, 2028 | S-corporation and partnership returns (or extensions) for the 2027 tax year |
| Apr 18, 2028 | Individual and C-corporation returns (or extensions) · Q1 2028 estimates · 2027 IRA/HSA contribution deadline · CA personal returns, Q1 estimate, and LLC franchise tax (Apr 15 falls on a weekend; DC holiday Apr 17) |
| Jun 15, 2028 | Q2 2028 federal and CA estimates · CA LLC estimated fee |
California personal estimated payments are weighted — 30% (Q1), 40% (Q2), 0% (Q3), 30% (Q4) — so most CA individual filers make no state estimate payment in September. California LLCs also owe the $800 annual franchise tax by the 15th day of the 4th month of their tax year. Questions about which dates apply to you? Ask us — that's what we're here for.
Industry News & Updates
The latest headlines in tax and accounting — from the IRS, SEC, and leading industry publications. Updated automatically throughout the day.
- IRS Newsroom — all current news releases
- IRS Tax Tips — short, practical guidance for taxpayers
- California FTB Newsroom — state tax updates
Headlines link to the original publishers. For how any of this affects your situation, give us a call.
Secure Client Portal
Share documents with our office through our encrypted client portal — safer than email.
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Start with a free consultation
Call, email, or stop by — we'll be happy to talk through your situation and give you a clear picture of how we can help.
Office
Address 1860 Howe Ave, Suite 260
Sacramento, CA 95825
Phone (916) 424-6233
Email info@stgroupcpa.com