Late Tax Returns: Bringing a New Client Up to Date

Bring a new client’s late tax returns up to date by identifying every missing year, rebuilding the records and lodging in order. Then resolve incorrect assessments, penalties and the debt or refund the catch-up produces.

Catching Up a Client’s Late Tax Returns

Find every outstanding year and gather its records before lodging overdue tax returns, usually oldest first unless the ATO directs another order. Earlier losses and closing balances can affect later years. Keep each year’s evidence separate so an assumption does not spread through several returns.

Overdue prior-year returns remain overdue when you become the agent. The ordinary lodgment program does not give those returns a fresh concession. Lodge as soon as possible and respond promptly to any ATO demand.

A lodgment deferral does not erase prior-year lateness, although eligible new or re-engaged clients can receive a temporary suspension of compliance action. The ATO’s deferral guidance separates that suspension from a deferral for the current return. Penalties and interest for overdue years can still apply.

For each missing year, first decide whether the client actually had to lodge. Low income alone does not establish that a return was unnecessary. Tax withheld, business income and other circumstances can create a lodgment obligation.

Where no return is required, lodge a return not necessary advice for that year through Online services for agents or the client update transaction in your tax software. Use further return not necessary only when future returns are also unnecessary. The ATO explains the distinction in its non-lodgment guidance.

Check whether the ATO has already issued a default assessment based on estimated income. If you disagree, prepare an objection with evidence of the correct position and address any associated penalty assessment. Simply lodging a late return does not replace the required objection. Follow the ATO’s default assessment instructions.

Finding Which Years Are Outstanding

Read the client’s ATO history against their own records before deciding how many years need work. Once your practice has authority and the appropriate client link, use Online services for agents to inspect each entity separately.

1. Open the client summary and select Lodgment, then Income tax and History. Record lodged, processing and outstanding years.
2. Read the available notices of assessment and ATO correspondence. Identify default assessments, demands to lodge and discrepancies with the client’s recollection.
3. Check outstanding activity statements separately. Record those obligations even when this engagement initially covers income tax returns only.
4. Ask the client about earlier years outside the displayed report. Reconcile the full history with previous assessments and any ATO letters.
5. Agree the number of years, catch-up work and fee in the engagement letter before starting. State whether amendments, objections and remission requests are included or separately agreed.

Ask for income statements or payment summaries, bank interest and investment records for every missing year. Collect deduction receipts and the facts supporting each claim. For business years, obtain sales records, bank statements, expenses, asset records and opening balances. Request every ATO letter, including correspondence the client has already answered.

Available pre-filling reports help identify reported wages, interest and other third-party information. They cannot establish that the client reported all income or has evidence for deductions. Older records and business transactions often need reconstruction from the client’s documents.

The ATO’s prior-year PLS guidance distinguishes pre-filling reports from automated checks in tax software. Pre-fill, pre-lodge and interactive checking are unavailable for prior-year PLS lodgments. Confirm that your software supports each missing year before preparing its return.

Keep the successful lodgment receipt for every year. If a prior-year return remains absent from the lodgment report after 12 days, contact the registered agent phone service with the receipt. Do not lodge a duplicate unless the ATO directs you to do so.

Failure to Lodge Penalties and ATO Penalty Remission

A failure to lodge on time penalty depends on how late the document is and the entity’s size, not the amount of tax payable. The base calculation is one penalty unit for each 28-day period, or part period, up to five units per document. Larger entities face higher multipliers. The ATO sets out the calculation in PS LA 2011/19.

The Commonwealth penalty unit is $364 under the 2026 penalty-unit instrument. That amount applies only to infringements within the instrument’s commencement rule. Older overdue returns can attract earlier unit values, so use the applicable period rather than pricing every missing year at $364. At that unit value, five base units total $1,820 before any size multiplier.

Coming forward and lodging is useful, but it does not guarantee the ATO will waive penalties. The ATO generally does not impose an FTL penalty where a late return produces a refund or nil result. Exceptions include a penalty imposed before lodgment and large entities. A return producing tax payable needs its own assessment of the circumstances.

After lodging the outstanding returns, use this sequence for an FTL remission request.

1. Identify the penalty notice, affected return and amount. Explain whether you seek full or partial remission.
2. Set out what prevented lodgment and how long it affected the client. Attach evidence of serious illness, a disaster or another circumstance outside their control.
3. Describe the client’s earlier compliance history and the steps taken to catch up. Explain how the practice will prevent another missed return.
4. Send the request through Practice mail in Online services for agents. Select Debt and lodgment, then Remission of failure to lodge on time penalty.
5. Save the request and decision on the file. Read any refusal’s review rights before the response period expires.

The ATO’s remission guidance explains the circumstances it considers. Its Practice mail guide lists separate FTL, general interest and shortfall interest subjects.

General interest charge (GIC) on overdue payment is separate from an FTL penalty. Request GIC remission separately, explaining why payment was delayed and what the client did to reduce that delay. A successful penalty remission does not automatically remove interest or the underlying tax.

Ordinary mistakes and administrative penalties differ from deliberate tax fraud or evasion. Serious tax crimes can lead to prosecution and imprisonment. Persistent non-lodgment can also lead to prosecution. If records suggest deliberate concealment, fabricated claims or an existing criminal investigation, obtain specialist legal advice before making representations. Neither an amendment nor voluntary disclosure guarantees immunity.

How to Amend a Tax Return the Previous Agent Lodged

An amendment corrects an assessed return, whether the previous agent, your practice or the client lodged it. Check the applicable amendment period before preparing the correction. Receiving a refund does not prevent an amendment or allow the client to keep an overpaid refund.

Most individuals have two years from the day after notice of the assessment is given. The ordinary review period for eligible small and medium businesses is also two years. Other cases generally have four years, including cases outside the two-year rules. Partnerships and trust interests can change which rule applies.

Eligible small and medium businesses have an additional taxpayer-requested amendment route after their ordinary two-year period ends. It permits an approved-form application within four years of the original assessment. It applies only to assessments and income years covered by the amending law. Read section 170 with the application rule in Schedule 3. Do not treat every older business assessment as eligible.

Fraud or evasion permits ATO amendments beyond the normal period. That power does not give a client an unrestricted right to seek a favourable correction. Where the ordinary period has expired and no special rule applies, consider an objection and any required late-objection request.

1. Obtain the lodged return and assessment. Request the previous accountant’s workpapers through the agreed clearance and records handover.
2. Identify the exact error, corrected amount and supporting evidence. Write down why the original treatment was wrong and which year is affected.
3. Recalculate the complete return. Check dependent losses, deductions and later-year balances before changing only one label.
4. Obtain the client’s approval and required declaration. Submit the amendment through your tax software’s practitioner lodgment service (PLS).
5. Where an electronic amendment is unavailable, use the ATO’s approved amendment route for that entity. Practice mail lists entity-specific income tax amendment subjects.
6. Keep the receipt and review the amended assessment when it arrives. Reconcile the changed tax, interest and any refund with the client’s account.

The ATO’s amendment instructions confirm that PLS can amend a return originally lodged through another method. The same evidence and time-limit checks apply to self-lodged returns and errors your current practice discovers.

An amendment increasing tax can produce shortfall interest charge and a shortfall penalty, depending on the error and the care taken. A voluntary disclosure can reduce an applicable penalty. The ATO’s voluntary disclosure guidance makes timing and cooperation relevant. Give enough detail to identify the shortfall and correct liability, rather than assuming any amended return earns the largest reduction.

The amendment application deadline and processing time answer different questions. Submit within the applicable legal period even if the ATO will finish processing later. The ATO’s correction guidance gives processing periods of 20 business days online and 50 business days by mail or fax. Requests needing more information can take longer. Follow up using the receipt and respond to any evidence request without lodging another amendment for the same change.

Paying the Tax the Catch-Up Raises

Several returns lodged together can produce one substantial debt or a refund reduced by offsets. Estimate the result before the client approves lodgment, so they can prepare funds or discuss an ATO payment plan.

In this fictional example, all amounts exclude interest and penalties. An individual has an existing assessed tax debt when the two refund years are processed.

Catch-up assessment	Result	Effect on existing debt
Debt year	$8,000 tax payable	$8,000 owing
First refund year	$2,500 refund	Debt falls to $5,500
Second refund year	$1,500 refund	Debt falls to $4,000

The two refunds total $4,000, leaving $4,000 payable after offsetting against the $8,000 debt. The client does not receive those refunds as cash. The ATO’s offsetting explanation confirms that refunds and credits normally repay outstanding debt first.

Actual processing order matters. If a refund is paid before another year’s debt is assessed, the later debt still needs funding. Review every assessment and account transaction before confirming the final balance. Include interest, penalties and any other debts when explaining what the client must pay.

Asking About Unlodged Years at Onboarding

Ask every new client about unlodged returns and activity statements before agreeing the first job. Ask whether the ATO has written to them and whether an earlier return contains an error. Put the answers on the client form so staff can follow up on each missing year.

Collect ATO letters, notices of assessment and records for every missing year through your practice’s secure document channel. Request the last lodged return as well. It provides the starting point for checking carried-forward amounts and suspected earlier mistakes.

Agree a catch-up timetable with the client and record it on the file. Give each year a staff owner and record when the client must supply missing evidence. Track amendments and remission requests separately from returns still awaiting lodgment.

Before closing the catch-up job, account for every year with a lodged return, a non-lodgment advice or an identified assessment dispute. Match receipts to the ATO history and explain the final account balance to the client. Leave a named next action for any processing delay or unresolved objection, so the outstanding work stays visible.