MIOBX Fees and Costs — MFS Income Fund, Class B
Data updated: 2026-09-28
The net expense ratio is 1.48%: a 0.42% management fee, a 1.00% 12b-1 fee plus 0.13% other expenses, less a 0.07% fee waiver. This share class carries a deferred sales charge of up to 4.00%. In fiscal 2025 the fund paid $264K in broker commissions, 0.0040% of average net assets, and portfolio turnover was 26%.
MIOBX Fees and Expenses
Annual operating expenses and sales charges of MIOBX. Prospectus, as of October 31, 2025.
| Annual operating expenses | |
|---|---|
| Management fee | 0.42% |
| 12b-1 fee | 1.00% |
| Other expenses | 0.13% |
| Gross expense ratio | 1.55% |
| Fee waiver | −0.07% |
| Net expense ratio | 1.48% |
| Sales charges | |
|---|---|
| Max front load | 0.00% |
| Max deferred load | 4.00% |
| Redemption fee | — |
| Expense limitation in place (N-CEN) | Yes |
| Fees waived or reduced during the year | Yes |
| Waived fees subject to recoupment | No |
MIOBX Costs Over Time
On $10,000 invested in MIOBX, assuming 5% a year before costs, total costs come to $919 over 5 years, cutting the return by 1.56% a year. Illustration, not a forecast: it assumes today's net expense ratio throughout (a fee waiver may end).
| $10,000 invested | Sell after 1 year | Sell after 3 years | Sell after 5 years |
|---|---|---|---|
| Value before costs | $10,500 | $11,576 | $12,763 |
| Sales charges | $414 | $0 | $0 |
| Fund expenses (net expense ratio 1.48%) | $155 | $482 | $832 |
| Trading costs (broker commissions) | $0 | $1 | $2 |
| Lost growth on money paid in costs | $0 | $24 | $85 |
| Total costs | $570 | $508 | $919 |
| Value after costs | $9,930 | $11,068 | $11,844 |
| Impact on return, per year | 5.70% | 1.56% | 1.56% |
MIOBX Trading Costs
Brokerage costs reported on SEC Form N-CEN for the fiscal year ending October 31, 2025.
- Explicit cost rate (commissions ÷ average net assets): 0.0040%
- Total broker commissions: $264K
- Bought from dealers (principal trades, not a cost): $4.7B
- Portfolio turnover (prospectus): 26%
- Securities lending: none during the year
MIOBX Agency Brokers
Commissions paid.
| Broker | Amount | Share |
|---|---|---|
| Merrill Lynch, Pierce, Fenner & Smith Inc. | $264K | 100.00% |
MIOBX Dealer Counterparties
Securities bought directly from dealers (principal trades).
| Broker | Amount | Share |
|---|---|---|
| J.P. Morgan Securities LLC | $613.1M | 17.96% |
| Citigroup Global Markets Inc. | $564.1M | 16.53% |
| BofA Securities, Inc. | $454.7M | 13.32% |
| Morgan Stanley & Co. LLC | $430.2M | 12.60% |
| Goldman Sachs & Co. LLC | $348.5M | 10.21% |
| Mizuho Securities USA LLC | $269.4M | 7.89% |
| Barclays Capital, Inc. | $205.6M | 6.02% |
| RBC Capital Markets, LLC | $189.0M | 5.54% |
| Natwest Markets Securities Inc. | $177.4M | 5.20% |
| Wells Fargo Securities, LLC | $161.3M | 4.73% |
MFS Income Fund Share Classes
Net expense ratio and maximum front-end load of each share class, cheapest first.
| Ticker | Class | Net expense ratio | Front load |
|---|---|---|---|
| MFIWX | Class R6 | 0.40% | none |
| MFIIX | Class I | 0.48% | none |
| MFIOX | Class A | 0.73% | 4.25% |
| MIOBX | Class B | 1.48% | none |
| MIOCX | Class C | 1.48% | none |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.