Cleanup vs monthly bookkeeping
How to tell whether the file needs a one-time cleanup, ongoing bookkeeping, or the cleanup first — and the cost logic of each order.
OpenIllinois
Illinois cleanup and catch-up bookkeeping
Months — or years — behind on the books? We’ll catch you up.
A QuickBooks® ProAdvisor reconstructs an Illinois file that’s fallen behind — categorizing the backlog, rebuilding the 6.25%-plus-local sales-tax figures by jurisdiction, recording the Illinois net income the PPRT needs, and separating Chicago’s cloud tax — until the books are current and CPA-ready. Fixed-fee, all 102 counties.
Catch-up bookkeeping: $2,000–$20,000+What sets the price
If your file needs our paid diagnostic first, its fee is credited in full against the cleanup. Either way, you get a fixed fee in writing before any work starts.
State rule
Illinois rule: Form IL-941 is due quarterly and must be filed even if no tax was withheld; catch-up rebuilds the withholding liability for each missed quarter so it ties to the payroll register before your CPA files. Source: IDOR, Form IL-941 instructions.
§ The short version
Illinois cleanup and catch-up bookkeeping brings a file that is months or years behind back to current for a fixed fee, typically $2,000–$20,000+, with the 6.25%-plus-local sales tax rebuilt by jurisdiction. We reconcile each bank and credit-card account to source statements, investigate unmatched balances, document corrections and hand over a period-by-period exception register.
They took something that felt overwhelming to me as a first-year business owner and made it simple.
What stood out the most was TechBrot Inc’s attention to detail.
Intuit QuickBooks Certification Level 2 and QuickBooks Workforce Certification,
§ 01 · Why an Illinois backlog is more than messy
Three Illinois liabilities a backlog keeps running.
Falling behind in Illinois isn’t just untidy — these three obligations keep accruing whether the books are current or not.
PPRT
Missing years owe an entity-level tax
Illinois imposes the entity-level Personal Property Replacement Tax on net income — 2.5% for C-corps, 1.5% for S-corps, partnerships, and trusts, so even pass-throughs owe it. When the books sit untouched, the Illinois net income for those years was never recorded, so the PPRT has nothing to compute from. Catch-up reconstructs that net income period by period; your CPA computes and files.6.25% + local
Uncollected sales tax piles up by jurisdiction
Illinois sales tax runs 6.25% state plus county, home-rule and transit taxes by location (the transit portion rose 0.25 points in Cook, DuPage, Kane, Lake, McHenry and Will counties on August 1, 2026); a sale from an Illinois source carries the local rate where it is sourced, and a sale to an Illinois buyer sourced outside Illinois carries the rate where the goods are delivered (IDOR FY 2026-12). Every month the books sit, ST-1 periods close with the combined liability under-reconstructed by jurisdiction. Catch-up rebuilds the correct combined rate by location across the missing periods so your CPA can address any prior-period exposure.Cloud tax
Chicago’s cloud tax accrues un-tracked
Chicago’s Personal Property Lease Transaction Tax — the “cloud tax,” 15% as of January 2026 — can apply to non-possessory computer leases (cloud and SaaS) and equipment leases used in Chicago; whether software is taxable under Illinois sales tax is your CPA’s determination. In a behind file that liability accrues untracked. Catch-up reconstructs it separately from sales tax. It’s a City of Chicago tax (Dept of Finance), not a state tax.§ 02 · What catch-up bookkeeping covers
From a backlog to current and CPA-ready.
We reconstruct the books period by period until the file is caught up — with the Illinois figures rebuilt.
01
The backlog categorized
Every untouched transaction across the missing months or years categorized to an Illinois-correct chart of accounts.Bookkeeping services
02
Sales-tax figures rebuilt
The 6.25%-plus-local combined liability reconstructed by jurisdiction so the ST-1 figures tie and your CPA can address any prior-period exposure.Sales tax help
03
PPRT net income reconstructed
Illinois net income rebuilt for the missing years so the Personal Property Replacement Tax is supportable. Your CPA computes and files.Replacement tax help
04
Chicago cloud tax separated
Chicago’s 15% lease/cloud-tax liability reconstructed separately from sales tax for the periods it accrued untracked.Sales tax help
05
Every account reconciled
Bank, credit-card, and loan accounts reconciled across the caught-up periods so the file actually ties.Reconciliation
06
Stays current after
Move into monthly bookkeeping with the same preparer so the backlog never builds again.Monthly bookkeeping
07
Reconciliations that will not tie
A reconciliation that won’t tie usually traces to a few causes: transactions entered but never cleared, duplicate bank-feed entries, a wrong beginning balance, items dated in the wrong period, or undeposited funds hiding deposits. Catch-up fixes the cause at the source instead of parking the difference in a discrepancy account, then ties the sales-tax liability to each ST-1 at the combined rate, keeps Chicago’s lease/cloud tax in its own liability account, and ties the loan and clearing accounts to their statements.Why reconciliations fail
§ 03 · The scope
What we do — and what we don’t.
What TechBrot does
- Categorize months or years of backlog to an Illinois-correct chart of accounts
- Reconstruct the 6.25%-plus-local sales-tax liability by jurisdiction
- Rebuild the Illinois net income the PPRT relies on for the missing years
- Reconstruct Chicago’s lease/cloud-tax liability separately from sales tax where it applies
- Reconcile bank, credit-card, and loan accounts across the caught-up periods
- Hand a current, CPA-ready file to your CPA
What your CPA does
- File the Illinois sales tax (ST-1), income tax, the PPRT, or the PTE election
- File Chicago city taxes (lease/cloud) or amend prior-period returns
- Represent you before the Illinois Department of Revenue or the City of Chicago
- Provide legal or tax advice
- Step 1
Free file review
A QuickBooks ProAdvisor reviews how far behind the file is and what catch-up requires. - Step 2
Written fixed-fee scope
A written scope and fixed fee within 3 business days, with the timeline and periods listed. - Step 3
Reconstruct period by period
We categorize the backlog, rebuild the Illinois figures by jurisdiction, and reconcile each period back to clean. - Step 4
Current & CPA-ready
A current, reconciled file handed to your CPA — or straight into monthly bookkeeping so it stays current.
§ 05 · The advisory line
Automation handles the data entry. We handle the judgment.
An Illinois bookkeeping backlog is a quiet liability: ST-1 sales-tax periods keep closing with the combined rate under-reconstructed by jurisdiction, the entity-level PPRT still needs Illinois net income for years that were never recorded, and Chicago’s lease/“cloud” tax keeps accruing untracked — all while the records to support them don’t exist yet. Catch-up reconstructs the work so your CPA can file accurately for the missing years.
Once you’re current, the same preparer keeps it that way in monthly bookkeeping — so you never need a second catch-up.
§ 06 · Around this page
Around Illinois.
Illinois QuickBooks ProAdvisor & bookkeeping
The state page: services, industries, cities and the Illinois tax terms in one place.Cleanup & catch-up bookkeeping, nationally
The national engagement this page is the Illinois version of — same scope, same written fixed fee.Also in Illinois
Illinois cities
Not sure where your file stands? Start with the free QuickBooks file review · how Illinois compares: state-by-state tax quirks.
§ 07 · Around the engagement
Before you engage anyone.
QuickBooks cleanup cost estimator
A scope-based estimate for a focused, standard, or complex cleanup from your months behind, number of accounts, and transaction volume.
Open§ 08 · Common questions
Illinois catch-up bookkeeping questions.
What does Illinois catch-up bookkeeping include?
A QuickBooks ProAdvisor categorizes months or years of untouched transactions to an Illinois-correct chart of accounts, reconstructs the 6.25%-plus-local sales-tax liability by jurisdiction, rebuilds the Illinois net income the PPRT relies on, separates Chicago’s lease/cloud tax, and reconciles every account — until the file is current and CPA-ready.
How is this different from a QuickBooks cleanup?
A QuickBooks cleanup fixes how the file is configured — sales-tax setup by jurisdiction, the chart of accounts, separating Chicago’s cloud tax. Catch-up bookkeeping reconstructs the missing work itself: the months or years of transactions that were never recorded. They’re complementary, and many behind Illinois files need both — we scope whichever (or both) the file needs.
How many years behind can you catch up?
Any distance — from a few months to several years. The further behind, the larger the scope and timeline; a multi-year Illinois file is reconstructed the same way, period by period, back to current and CPA-ready. We confirm the exact periods and timeline during a free file review.
Will catching up create a tax bill?
Catch-up itself doesn’t create tax — it produces the accurate records your CPA needs to determine what was actually owed for the missing periods. If prior-period sales tax, the PPRT, or Chicago’s cloud tax was under-reported, your CPA addresses the filing; we make sure the books behind it are right.
How much does Illinois catch-up bookkeeping cost?
Fixed-fee against a written scope, never hourly — typically $2,000–$20,000+ depending on how many months or years are behind and the transaction volume. You get the exact fee in writing within 3 business days of a free file review.
Do you file my back taxes after catching up?
No. TechBrot is a bookkeeping and advisory firm — we reconstruct the books to CPA-ready and coordinate with your CPA, who files or amends the Illinois sales tax (ST-1), income tax, the PPRT, and any Chicago city taxes.
My sales-tax liability never matches my ST-1. Can you fix that?
Usually, yes. That mismatch tends to mean sales tax was set to a single rate instead of the combined rate for each location (the 6.25% state rate on general merchandise plus local rates, which vary by location and change; the NITA rate rose 0.25% in six counties on August 1, 2026), or the liability account was never reconciled to what was filed. We reconcile the liability to each ST-1 so the books show what was over- or under-remitted, and correct the prior periods as part of the cleanup; your CPA addresses any prior-period filing.
Checked against the Illinois Department of Revenue and the City of Chicago Department of Finance.
Illinois businesses start here