Visa Tips: 40 Easily Overlooked Details for the US, UK, Canada, Australia, New Zealand, and Hong Kong

Visa issues rarely stem from major directional errors; more often, they are caused by minor details: a date off by a few days, a document that can only be used once, an overlooked deadline, or an unknown restriction. This article compiles the most easily overlooked details we have verified across our various visa articles, categorized by country. Each point clarifies "what it is" and "why it matters."

I. United Kingdom

1. The 28-day and 31-day rules are two separate conditions. Funds must be held for 28 consecutive days, and the last day of this 28-day period must be no more than 31 days before the visa application date. Depositing too early, withdrawing money in the middle, or letting the balance drop below the required amount on any day can lead to non-compliance.
2. Overdraft limits do not count as funds. Stocks, bonds, credit card limits, and pensions that cannot be withdrawn immediately are also excluded.
3. Using parents' funds requires two documents: proof of relationship and a written letter of consent from your parents allowing you to use their money. Accounts belonging to other relatives, such as uncles, are generally not accepted.
4. Foreign currencies are converted using the OANDA exchange rate on the day of application. Exchange rates fluctuate, so leave a buffer in the amount.
5. TB test certificates are valid for only 6 months, calculated from the date of the X-ray. If your visa application is delayed, the certificate may expire.
6. A CAS can only be used once. It is considered used once it has been applied for a visa application and a decision has been made. If refused and reapplying, the school must issue a new CAS.
7. ATAS clearance takes at least 6 weeks, and even longer during the peak season from April to August. It must be obtained before submitting your visa application.
8. Do not leave the UK while extending your visa from within the country. Leaving the UK before a decision is made will result in your application being considered withdrawn.
9. Submitting a new application during an administrative review will withdraw the review. Administrative reviews can take over 12 months, so weigh your options carefully.
10. The Immigration Health Surcharge is fully refundable after a refusal, typically processed within 6 weeks; however, it is non-refundable if you withdraw your application after approval or if you do not travel to the UK.

II. Canada

1. Biometrics must be collected within 30 days from the date on the instruction letter. IRCC only begins processing after receiving your biometrics. Delaying this will delay the start of processing.
2. You cannot reapply with the same PAL/TAL after a refusal. You must have the school apply for a new one (with the exception of the CAQ for Quebec).
3. A study permit cannot exceed your passport's validity. If your passport is expiring soon, renew it before applying.
4. The 24-hour off-campus work limit is the total for all jobs combined. You cannot exceed this limit even if you have multiple jobs, and you cannot work before classes start.
5. Your study permit must state the work conditions to apply for a Social Insurance Number (SIN). If you meet the conditions but it is not printed on your permit, you must first apply to have it added.
6. Apply for an extension at least 30 days before it expires. If it has already expired, you only have 90 days to apply for restoration of status, and you cannot attend classes before it is restored.
7. Spousal open work permits are program-restricted: the student must be enrolled in a master's, doctoral, or designated professional degree program lasting at least 16 months.

III. Australia

1. Declare all family members when applying, even if they are not traveling with you immediately. Failure to declare them will prevent them from joining you in Australia as your dependents in the future.
2. Missing documents may lead to an immediate refusal. The Department of Home Affairs will not chase you for them.
3. The 48-hour per fortnight work limit also applies before classes start, not just during the academic term.
4. OSHC must be maintained for your entire stay in Australia. If you extend your studies, your insurance must be extended accordingly.
5. Biosecurity declaration: if in doubt, declare it or leave it behind. Failure to declare items can result in fines of up to AUD 6,600 and potential visa cancellation.
6. GS (Genuine Student) responses must reflect your personal circumstances. Copying generic templates from the internet will not help.

IV. United States

1. The SEVIS fee must be paid before the visa is issued. Bring the payment receipt to your visa interview.
2. The travel signature on your I-20 must be less than one year old. Before traveling and re-entering, ensure your DSO's signature has not expired.
3. Do not stay outside the U.S. for more than 5 months.
4. An expired visa is fine as long as you remain in the U.S.; however, you must reapply for a visa abroad if you leave. If you return home to renew your visa over the summer, allow plenty of time.
5. If you cannot make it in time for the start of classes, ask your school to defer the program start date before traveling to the U.S. to issue a new I-20. You cannot defer after entering the country.
6. I-20 extensions must be processed before the program end date.
7. F-2 dependents are not allowed to work.
8. The cash declaration limit is calculated collectively for people traveling together. A family must declare it if their combined total exceeds $10,000.
9. Unauthorized work will result in the termination of your SEVIS record, and you must leave the U.S. immediately.

V. Singapore and Hong Kong

1. In addition to the SGD 45 processing fee for a Singapore Student's Pass, there is an SGD 60 issuance fee when completing the formalities upon approval. If a multiple-entry visa is required, an additional SGD 30 applies.
2. During the academic term in Singapore, you can work up to 16 hours per week, and only full-time students at designated institutions are eligible.
3. After approval for Hong Kong, you must also apply for an Exit-Entry Permit for Travelling to and from Hong Kong and Macao and the relevant endorsement. Factor this processing time into your overall timeline.

VI. General Rules for All Countries

1. Your name must exactly match your passport. Watch out for typos and autocorrect errors.
2. Previous visa refusals must be declared truthfully, including those from other countries.
3. Medical exams must be conducted at officially approved panel physicians. Examinations from regular hospitals are not accepted.
4. Keep your entry documents in your carry-on luggage. You will not have access to your checked baggage before clearing customs.
5. Add all expiration dates to your calendar: visa, permit, I-20, passport, insurance, TB test certificate, and medical exam results.

Final Notes

Individually, these details are not complicated, but overlooking even one can stall your entire application. We recommend writing down the points relevant to you and checking them against each stage of the visa process.

For more comprehensive information, you can search by stage in our Visa FAQ Summary; for processing steps, see Visa Application Process, and for common misconceptions, see 10 Common Misconceptions About Student Visas.

Verification Note: All points in this article are sourced from our visa series (Articles 41–47, 51–71). These articles were verified in September 2026 against official sources including the U.S. Department of Homeland Security and Immigration and Customs Enforcement, UK GOV.UK, Immigration, Refugees and Citizenship Canada, the Australian Government's Study Australia, Singapore's Immigration and Checkpoints Authority and Ministry of Manpower, and the Hong Kong Immigration Department. Detailed sources for each point can be found in the corresponding articles. Due to CAPTCHA on the U.S. Department of State website, U.S. cash declaration regulations are compiled from search summaries of the U.S. Customs and Border Protection website. Policies are subject to change; please refer to the latest official information.