O-1 (Second Lieutenant) Pay with 18 Years of Service — 2026
An O-1 (Second Lieutenant) with 18 years of service earns $5,222.40 per month in base pay in 2026, which is $62,668.80 per year. Base pay is the taxable portion of military compensation and does not include housing or food allowances.
When you add the national average BAH of $2,335/mo (with dependents) and BAS of $328.48/mo, total monthly compensation comes to approximately $7,886. BAH and BAS are tax-free, making the effective compensation even higher than it appears.
Monthly Compensation Breakdown
| Component | With Dependents | Without Dependents |
|---|---|---|
| Base Pay | $5,222.40 | $5,222.40 |
| BAH (national avg) | $2,335 | $1,975 |
| BAS | $328.48 | $328.48 |
| Total | $7,886 | $7,526 |
BAH varies by location. Use the BAH Calculator for your exact rate.
O-1 Pay Progression by Years of Service
See how O-1 base pay changes as you gain more time in service:
| Years of Service | Monthly Base Pay | Annual |
|---|---|---|
| 0 years | $4,150.20 | $49,802.40 |
| 2 years | $4,320.00 | $51,840.00 |
| 3 years | $5,222.40 | $62,668.80 |
How O-1 Compares to Other Ranks at 18 Years
| Rank | Base Pay (18 YOS) | Difference |
|---|---|---|
| O-1 | $5,222.40 | — |
| O-2 | $6,617.70 | +$1,395.30 |
More O-1 Pay Information
- O-1 with 16 years of service
- O-1 with 20 years of service
- Full O-1 Pay Table (all years)
- All Military Pay Charts
Frequently Asked Questions
How much does an O-1 make with 18 years of service?
An O-1 (Second Lieutenant) with 18 years of service earns $5,222.40/month in base pay ($62,668.80/year). With BAH and BAS, total compensation averages $7,886/month with dependents.
What is O-1 base pay at 18 years?
2026 O-1 base pay at 18 years of service is $5,222.40/month. This is the taxable portion of military pay.
Is military pay taxable?
Base pay is subject to federal income tax. BAH and BAS are tax-free. For an O-1, this means $2,663.48/month in allowances is untaxed, significantly reducing your effective tax rate.
O-1 at 18 years, in context
This exact cell of the pay table — O-1 over 18 years — pays $191 more per month than it did in 2025 (3.8% increase, $2,293 a year).
O-1 base pay is capped at this point — there are no further longevity raises on this row. Additional base-pay growth at this rank only comes from promotion.
For comparison, O-2 pay at the same 18 years of service is $6,618/mo — promotion here is worth $1,395/mo.