Fifty states. One engine. Zero gaps. US payroll, owned.
US payroll is not a single-country problem. It demands a multi-jurisdictional tax engine spanning 50 states, 6,000+ local tax codes, federal FICA withholding, at-will employment law, ACA health-mandate tracking, and real-time IRS compliance – simultaneously. Most providers handle the federal layer. Mercans handles all of them – on a single proprietary stack with no intermediaries.
native payroll
vs nearest peer
since inception
- SS Wage Base
- $184,500 (2026)
- SS Rate (each)
- 6.2% employer + 6.2% employee
- Medicare Rate
- 1.45% each · no cap
- Additional Medicare
- +0.9% on wages > $200K
- Federal Tax Brackets
- 7 brackets · 10%–37%
- State Income Tax
- 0%–13.3% · 50 regimes
- FUTA
- 6.0% on first $7,000 · eff. 0.6%
- Federal Min. Wage
- $7.25/hr (FLSA)
- Overtime
- 1.5× after 40 hrs/wk
- Exempt Threshold
- $35,568/yr ($684/wk)
- ACA Mandate
- 50+ FTE employers
- 401(k) Limit
- $23,500 + $7,500 catch-up
- W-2 / 1099-NEC
- Due Feb 2, 2026
- Employment
- At-will · 49 states
- Workers’ Comp
- Required 49 states
Payroll compliance: the details that can’t be missed
US payroll operates under a layered enforcement regime that most multinational employers underestimate. The IRS assesses Trust Fund Recovery Penalties on responsible individuals – not just the entity. The DOL audits FLSA misclassification retroactively. State agencies levy penalties independently of federal enforcement. ACA non-compliance triggers per-employee penalties exceeding $5,000/year. None of these failures announce themselves – they accumulate silently until an audit makes them very visible.
Multi-state withholding miscalculation
Remote workers, travel employees, and multi-state filers create nexus in states the employer never anticipated. Under-withheld state income tax triggers back-assessments, interest, and penalties in each affected jurisdiction.
FLSA misclassification – W-2 vs 1099
Misclassifying employees as independent contractors exposes the employer to retroactive FICA liability, unpaid overtime, benefits claims, DOL penalties, and IRS Section 3509 assessments – plus state-level penalties in parallel.
Trust Fund Recovery Penalty (TFRP)
The IRS holds responsible individuals – officers, directors, even payroll managers – personally liable for unpaid employment taxes. TFRP is 100% of the trust fund tax not collected, withheld, or paid over. Personal liability, not corporate.
ACA employer mandate penalty
Applicable Large Employers (50+ FTEs) that fail to offer affordable minimum-value health coverage face Penalty A ($3,340/employee/year) or Penalty B ($5,010/employee/year) – triggered when even one employee obtains a marketplace subsidy.
The three types of providers who struggle with United States
Global Aggregator Platforms
Platforms like Deel, Remote, and Rippling operate through a partner network for US payroll — they may handle contractor payments but typically route W-2 payroll through third-party processors. When state tax rules change mid-year, when a new local jurisdiction adds a payroll tax, when the IRS updates Form 941 – response time depends on partner SLAs, not direct capability.
- ×No direct multi-state tax engine — reliant on third-party tax tables
- ×1099 vs W-2 classification guidance absent or generic
- ×ACA tracking and 1095-C generation typically out of scope
- ×Local tax jurisdictions (city, county, school district) often unsupported
Large US-Centric Incumbents
ADP, Paychex, and similar incumbents dominate US domestic payroll — but their global consolidation is the weak point. Running US payroll in one system and international payroll in another creates reconciliation gaps, dual GL feeds, and fragmented compliance reporting for multinational employers.
- ×Strong domestically, weak on global consolidation
- ×International payroll via partners — separate contracts, separate SLAs
- ×No single-platform view across US + international entities
- ×Cost escalation on multi-state complexity — add-on pricing per jurisdiction
Regional CPA & PEO Firms
Regional CPA firms and PEOs know US payroll deeply — but they can’t scale internationally. No global payroll platform, no cross-border consolidation, no multi-country GL integration, and no data security certifications that multinationals require. Fine for a single-state employer. Inadequate for a company expanding globally.
- ×No international payroll capability — US-only coverage
- ×No global HCM connectors — Workday, SAP, Oracle feeds require custom work
- ×PEO co-employment model creates legal ambiguity for multinationals
- ×No enterprise data security certifications (SOC 1/2, ISO 27701, BCR)
The only provider that closes every gap
Mercans is the only US payroll provider that combines a proprietary multi-state tax engine, full-time in-country compliance teams, direct federal and state authority relationships, and enterprise-grade data security – simultaneously, on one contract, with no intermediaries.
The only engine built for America’s actual payroll architecture
G2N Nova™ is the world’s only API-first gross-to-net payroll engine. It natively models all 50 state tax regimes, 6,000+ local jurisdictions, federal FICA layering, multi-state reciprocity agreements, and real-time IRS deposit scheduling. W-2 and 1099-NEC generation, ACA affordability tracking, and 401(k) administration flow from the same calculation – not bolted-on modules. This isn’t configuration. It’s engineering.
Full-time US team – not a partner you phone when things break
Mercans employs full-time payroll and compliance professionals in the United States. They maintain active relationships with the IRS, SSA, DOL, and state agencies – not through a contact directory, but through ongoing regulatory engagement. When the IRS issues a revenue procedure, when a state changes its withholding tables mid-year, when DOL updates FLSA guidance – we know before it reaches your inbox.
The security posture multinationals require – and US regulators expect
US payroll data falls under a patchwork of federal and state privacy laws – including state-level breach notification statutes in all 50 states, IRS Publication 1075 safeguards, and industry-specific mandates like HIPAA for benefits data. Mercans holds BCR approval, ISO 27701 certification, SOC 1 & 2 certifications, and ISO 27017/27018 – the only payroll provider with this complete certification stack. Zero security breaches since inception.
Where Mercans wins on every US-specific capability
Each row is a US-specific capability. Each cell shows native coverage as a fill bar – full = native in-platform, half = partial / manual workaround, empty = gap.
US Capability Coverage · 11 dimensions
50 states + 6,000 local codes
50+ FTE affordability
US + international on one platform
Workday · SAP · Oracle
Every rate. Every cap. Every obligation.
US payroll operates on exact numbers with hard deadlines across federal, state, and local layers. Mercans builds every figure below into G2N Nova™ and monitors them proactively – so you’re never discovering a rate change from a penalty notice.
United States · Rate & Compliance Dashboard
Live 2026Multi-State Withholding – Not a Single Rate
The United States has 50 state income tax regimes plus DC, 9 states with no income tax, and thousands of local jurisdictions that levy additional payroll taxes. Reciprocity agreements between bordering states add further complexity. A compliant US payroll must calculate and withhold at the correct rate for each employee’s work state, resident state, and any applicable local jurisdiction – simultaneously.
→ All 50 states + 6,000 local codes modelled in G2N Nova™FICA Has a Ceiling and a Surcharge – Both Matter
Social Security tax stops at $184,500 in 2026. Medicare tax never stops – and adds a 0.9% surcharge on earnings above $200,000 (employee-only, not matched by employer). Payroll engines that don’t track cumulative year-to-date wages per employee will either over-withhold SS after the cap or miss the Additional Medicare trigger.
→ Real-time YTD wage tracking on every G2N Nova™ runAt-Will Employment Does Not Mean No Rules
49 states follow at-will employment doctrine, but every state layers exceptions – public policy, implied contract, and covenant of good faith. Federal protections (Title VII, ADA, ADEA, FMLA) apply nationwide. Wrongful termination claims are the most litigated US employment issue. Documentation and process are not optional.
→ State-specific compliance checks built into HR Blizz™ACA Affordability Changes Every Year
The ACA employer mandate affordability percentage for 2026 is 9.96% – the highest it has ever been. Employers must recalculate contribution thresholds annually. Failure to offer affordable minimum-value coverage triggers penalties of $3,340 (4980H(a)) or $5,010 (4980H(b)) per employee per year when marketplace subsidies are claimed.
→ ACA affordability tracker updated annually in HR Blizz™Run a US payroll. Right here, right now.
Switch worker type. Move the sliders. Every number you see is the same calculation G2N Nova™ runs in production – FICA layering, federal withholding, state tax modelling, and true cost of employment exposed live.
US Payroll Sample · Live
G2N Nova™ engineEight things only US payroll experts know to handle
These are the compliance details that don’t appear in standard payroll setup guides – but appear in every IRS audit, DOL investigation, and state agency assessment we’ve encountered in the US over 20 years.
Multi-State Withholding Is Not Additive – It’s Reciprocal
When an employee lives in one state and works in another, withholding depends on reciprocity agreements between those states. Some states require withholding at the work-state rate, others at the resident-state rate, and many have no reciprocity at all – requiring dual withholding with credit offsets. Getting this wrong means over-withholding from the employee or under-remitting to a state agency.
Social Security Cap Resets Every January – Mid-Year Hires Get It Wrong
The Social Security wage base ($184,500 in 2026) resets on January 1. For employees who change jobs mid-year, the new employer must withhold SS from dollar one – even if the employee already reached the cap at their prior employer. Over-withheld SS is recoverable only via the employee’s personal tax return, not through payroll.
W-2 vs 1099 Misclassification Is the Costliest US Payroll Error
The IRS uses a 20-factor test, the DOL uses the economic reality test, and states apply their own ABC tests. Misclassifying a W-2 employee as a 1099 contractor triggers retroactive FICA liability (both shares), unpaid benefits, overtime claims, workers’ comp penalties, and IRS Section 3509 assessments. California AB5 and similar state laws add further exposure.
FUTA Credit Reduction States Change Every Year
States that borrowed from the federal unemployment trust fund and haven’t repaid face FUTA credit reductions – meaning employers in those states pay a higher effective FUTA rate. In 2026, California and the US Virgin Islands carry credit reductions of 1.8% and 5.1% respectively. This changes annually and requires proactive monitoring.
ACA Look-Back Measurement Creates Hidden Liability
The ACA uses a look-back measurement period to determine full-time status for variable-hour employees. Employers must track hours over a 3–12 month measurement period, then lock in coverage for a corresponding stability period – even if hours later drop. Failing to track this correctly triggers per-employee penalties when marketplace subsidies are claimed.
FLSA Overtime Exemption Requires Both Salary AND Duties Tests
Paying an employee above $35,568/year does not automatically exempt them from overtime. The employee must also pass one of the FLSA duties tests (Executive, Administrative, Professional, Computer, or Outside Sales). Employers who classify based on salary alone face retroactive overtime liability – often spanning two to three years of back pay plus liquidated damages.
IRS Deposit Schedules Depend on Lookback Period Liability
The IRS assigns employers to either monthly or semi-weekly deposit schedules based on employment tax liability during a four-quarter lookback period. Employers exceeding $100,000 in accumulated liability on any single day must deposit by the next business day. Missing a deposit deadline triggers the Trust Fund Recovery Penalty – personally assessed on responsible individuals.
Local Payroll Taxes Are Invisible Until the Assessment Arrives
Over 6,000 local jurisdictions levy payroll taxes – city income taxes (NYC, Philadelphia, Detroit), county taxes, school district taxes (Ohio), and transit taxes (Oregon). These are not reported on federal returns and are often missed by payroll systems that only model state-level withholding. A single remote employee in the wrong city can create nexus and back-assessment exposure.
One workforce. Two entirely different compliance tracks.
The foundational split in US payroll – W-2 employees on FICA with full withholding vs. 1099 contractors with self-employment tax – is not a configuration toggle. It requires two distinct calculation engines, two sets of filing obligations, and two different liability frameworks. Mercans runs both simultaneously on every pay cycle.
Parallel Compliance Engines
FICA withholding is mandatory from Day 1. Employer matches SS 6.2% and Medicare 1.45%. Social Security caps at $184,500; Medicare has no cap. Additional Medicare of 0.9% applies on employee wages above $200,000 – not matched by employer.
Federal income tax is withheld per the W-4 election. Seven brackets from 10% to 37%. State income tax layered on top – ranging from 0% (nine states) to 13.3% (California). Local taxes in applicable jurisdictions. Multi-state employees require dual withholding with credit offsets.
ACA coverage is a payroll-integrated mandate. Applicable Large Employers must offer affordable minimum-value health coverage to 95% of FTEs. Affordability threshold is 9.96% of household income in 2026. 1095-C reporting required for every full-time employee.
W-2 generation is a January hard deadline. All W-2 forms must be furnished to employees and filed with SSA by February 2, 2026. Late or incorrect W-2s trigger IRS penalties of $60–$660 per form. Employers filing 10+ returns must e-file.
No FICA withholding – but classification must be correct. True independent contractors pay self-employment tax (15.3%) on their own. But misclassification exposes the employer to retroactive FICA for both shares, back benefits, overtime, and IRS Section 3509 penalties.
1099-NEC threshold raised to $2,000 for 2026. Payments of $2,000 or more to non-employees require 1099-NEC reporting. Due date is February 2, 2026 – no automatic extensions available. Backup withholding of 24% applies when the contractor fails to provide a valid TIN.
No ACA, no 401(k), no workers’ comp obligation. Contractors are excluded from employer benefit mandates – but this exclusion is only valid if classification is correct. Offering benefits to contractors can actually strengthen a reclassification argument against the employer.
State-level ABC tests create additional exposure. California (AB5), New Jersey, Massachusetts, and a growing list of states apply strict ABC tests that presume worker status is employee unless all three prongs are satisfied. Federal classification does not override state determinations.
Every obligation. Every authority. Mercans owns the calendar.
US compliance runs across the IRS, SSA, DOL, state agencies, and benefits administrators on payroll-cycle, quarterly, annual, and event-triggered cadences. Mercans’ managed payroll absorbs every filing as standard scope – you don’t track deadlines. We do.
IRS Employment Tax Deposits (FICA + FIT)
Federal income tax withheld plus employer and employee FICA deposited per the IRS-assigned schedule. Monthly depositors remit by the 15th of the following month. Semi-weekly depositors remit within 1–3 business days of payroll. $100,000 next-day deposit rule applies.
Form 941 – Employer’s Quarterly Federal Tax Return
Reports total wages paid, federal income tax withheld, and employer and employee FICA for the quarter. Reconciles against deposits made during the quarter. Discrepancies trigger IRS notices and potential penalty assessments.
Form W-2 – Wage and Tax Statement
Filed with SSA and furnished to every employee. Reports total wages, federal and state tax withheld, FICA, 401(k) deferrals, and employer health coverage cost (Box 12 DD). Late filing penalties range from $60 to $660 per form. Employers filing 10+ forms must e-file.
Form 1099-NEC – Nonemployee Compensation
Filed with IRS and furnished to every contractor paid $2,000+ (threshold raised from $600 for 2026). No automatic extension available. Backup withholding of 24% required when contractor fails to furnish a valid TIN on Form W-9.
Form 940 – FUTA Annual Return
Reports total FUTA-taxable wages and tax liability for the year. Must account for FUTA credit reductions in applicable states (California, USVI for 2026). Quarterly deposits required when FUTA liability exceeds $500.
Form 1095-C – ACA Employer Health Coverage
Applicable Large Employers (50+ FTEs) must furnish 1095-C to every full-time employee and file with IRS. Reports months of coverage offered, affordability safe harbor used, and employee enrollment status. Failure triggers per-form penalties and potential 4980H assessments.
State Withholding, UI & Workers’ Comp
Each state sets its own deposit schedule, UI tax rate, and workers’ comp requirements. Employers with employees in multiple states must register, withhold, deposit, and file in each jurisdiction independently. State new-hire reporting is mandatory within 20 days (federal) or shorter (state-specific).
401(k) Contribution Remittance
Employee elective deferrals must be deposited to the plan trust as soon as administratively feasible – DOL safe harbor is 7 business days for small plans, shorter for large plans. Late deposits are a prohibited transaction under ERISA and trigger DOL penalties plus lost-earnings calculations.
The US is one market. Mercans covers the entire Americas.
For companies running payroll across the Americas, complexity multiplies – not adds. Each country runs its own labor authority, social insurance body, and tax regime. Mercans covers the full Americas region on a single platform with country-specific compliance engines running in parallel.
countries
1 contract
consolidation
Americas
Every filing. Every format. Submission-ready.
Mercans generates the exact file types that the IRS, SSA, DOL, and state agencies expect to receive — not formatted summaries that need reformatting before you can submit them.
