An important group experiencing low income is a population commonly described as the «working poor.» These are families whose MIR had significant annual hours of paid work but whose total family income was less than their low income threshold.
This report uses the following definition of «working poor»: Footnote 17 persons aged 18 to 64 who are not full-time students, have worked for pay a minimum of 910 hours in the reference year living in families whose total disposable income is below the MBM low income threshold in that year for their community or community size and family configuration.
The MBM is well-suited to analysis of the «working poor» since its definition of disposable income takes into account expenses commonly incurred when the MIR in the family takes up paid work; including income taxes and the employee portion of payroll taxes, mandatory deductions for employer-sponsored benefits and out-of-pocket spending on child care and non-insured but medically recommended expenditures on prescription drugs, dental and vision care and aids, devices and supports for persons with disabilities.
To analyze low income by the MIR's work status, families are divided into four mutually-exclusive groups (Figure 6). In the vast majority of working-age families, Footnote 18 the MIR had at least 910 hours of paid work. Families where the MIR did not work for pay, was a full-time student or worked for pay between 1 and 909 hours accounted for much smaller shares of the total.

In 2007, 15.4% of all economic families where the MIR was aged 18 to 64 had a disposable income below their MBM low income threshold (Table 1a). Footnote 19 But the incidence ranged from 5.9% for families where the MIR had 910 hours or more of paid work to 47.3% for economic families where the MIR did not work for pay.
| MIRs by paid work status | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 |
|---|---|---|---|---|---|---|---|---|
| All MIRs 18-64 | 19.7 | 18.6 | 18.2 | 17.9 | 18.5 | 17.8 | 17.2 | 15.4 |
| MIR Full-Time Student | 54.0 | 51.0 | 52.5 | 46.1 | 50.1 | 46.9 | 48.2 | 42.9 |
| MIR 0 Paid Hours | 56.6 | 56.0 | 53.8 | 51.2 | 51.7 | 50.5 | 49.8 | 47.3 |
| MIR 1-909 Paid Hours | 42.1 | 36.8 | 41.2 | 40.3 | 42.4 | 40.3 | 35.3 | 33.9 |
| MIR 910+ Paid Hours | 8.3 | 7.7 | 6.9 | 7.7 | 7.9 | 7.9 | 7.3 | 5.9 |
As can be seen from Tables 1a and 1b, the incidence of low income for families where the MIR had at least 910 hours of paid work (and for children in such families) was much lower than for the other groups.
| Children < 18 by MIR's paid work status | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 |
|---|---|---|---|---|---|---|---|---|
| All MIRs 18-64 | 17.9 | 16.4 | 16.4 | 16.1 | 16.3 | 15.1 | 14.3 | 11.9 |
| MIR Full-Time Student | 53.2 | 42.1 | 47.7 | 43.8 | 36.5 | 40.8 | 34.3 | 25.4 |
| MIR 0 Paid Hours | 72.6 | 79.9 | 74.0 | 73.3 | 78.6 | 69.9 | 69.7 | 62.2 |
| MIR 1-909 Paid Hours | 49.4 | 42.5 | 51.0 | 53.5 | 45.6 | 40.9 | 41.0 | 38.8 |
| MIR 910+ Paid Hours | 9.7 | 8.2 | 7.5 | 8.3 | 8.4 | 8.4 | 6.9 | 5.6 |
While the risk of low income for economic families where the MIR had 910 hours or more of paid work was much lower than for the economic families with other work status, they still accounted for a substantial share (31%) of all low income working-age families Footnote 20(Figure 7). This was because they accounted for such an overwhelming majority (77%) of all working-age families (Figure 6).

A similar pattern held for children under age 18 living in economic families where the MIR was 18 to 64. Even though the risk of low income in 2007 for children under 18 in economic families where the MIR had 910 hours or more of paid work was by far the lowest, (Table 1b) there were 334,700 low income children in such families accounting for 43% of all low income children under age 18 in working-age families (Figure 8). This high share, despite the lower risk, is explained by the fact that a large majority (85.7%) of all children under age 18 in working-age families had an MIR who worked 910 hours or more (Figure 9). Footnote 21


As Table 2a reveals, the depth of low income for low income families where the MIR worked for pay 910 or more hours was also significantly lower than for some other groups- 30.2% in 2007 compared to 49.5% where the MIR was a full-time student and 38.3% where the MIR was a non-earner. As Table 2b, shows the same pattern prevailed (at much lower depths of low income) for children among the four groups.
| MIRs by paid work status | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 |
|---|---|---|---|---|---|---|---|---|
| All MIRs 18-64 | 37.8 | 36.9 | 36.6 | 36.6 | 37.0 | 37.8 | 37.1 | 37.6 |
| MIR Full-Time Student | 49.0 | 47.5 | 47.7 | 45.3 | 47.7 | 43.7 | 42.8 | 49.5 |
| MIR 0 Paid Hours | 39.0 | 36.7 | 37.4 | 38.2 | 37.4 | 38.3 | 38.9 | 38.3 |
| MIR 1-909 Paid Hours | 35.7 | 36.9 | 35.8 | 34.6 | 40.6 | 41.2 | 37.1 | 37.9 |
| MIR 910+ Paid Hours | 30.5 | 31.5 | 30.4 | 30.2 | 31.1 | 31.3 | 31.5 | 30.2 |
| Children <18 by MIR's paid work status | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 |
|---|---|---|---|---|---|---|---|---|
| All MIRs 18-64 | 25.9 | 27.1 | 25.6 | 26.2 | 27.4 | 27.7 | 24.6 | 25.4 |
| MIR Full-Time Student | 24.8 | 28.4 | 25.2 | 30.7 | 36.9 | 26.9 | 28.3 | 38.1 |
| MIR 0 Paid Hours | 29.2 | 32.6 | 31.3 | 30.4 | 31.1 | 30.4 | 27.6 | 25.8 |
| MIR 1-909 Paid Hours | 29.5 | 30.2 | 26.5 | 28.3 | 30.6 | 33.0 | 26.6 | 22.4 |
| MIR 910+ Paid Hours | 22.4 | 23.4 | 20.7 | 21.3 | 22.8 | 22.3 | 21.6 | 21.2 |
Adults and children in low income, working-age families where the MIR had at least 910 hours of paid work in 2002 (i.e. the «working poor») were also less likely to experience persistent low income Footnote 22 over the 2002 to 2007 period than those where the MIR had no hours of paid work in 2002. Note from Table 3a that only 22.0% (3.7/16.8) of those, in the former group, who experienced low income at least one year during this period also experienced persistent low income, compared to 59.0% (41.1/69.7) of those who had no paid hours of work in 2002. There was a similar contrast for children living in these families (Table 3b).
Between 2002 and 2007, families where the MIR was a full-time student in 2002 did not experience a statistically different risk of persistent low income than families who worked for pay between 1-909 hours in 2002 (Table 3a). This was also true for children living in these families. The differences between the other groups were statistically significant.
| MIRs by work status | Low Income At least 1 Yr | Low Income All Years | Persistent Low Income |
|---|---|---|---|
| All MIRs 18-59 | 25.4 | 3.4 | 8.1 |
| MIR Full-Time Student | 52.7 | 2.8 | 12.9 |
| MIR 0 Paid Hours | 69.7 | 25.7 | 41.1 |
| MIR 1-909 Paid Hours | 52.0 | 7.7 | 22.5 |
| MIR 910+ Paid Hours | 16.8 | 1.1 | 3.7 |
| Children <13 in 2002 by MIRs' paid work status | Low Income At least 1 Yr | Low Income All Years | Persistent Low Income |
|---|---|---|---|
| All MIRs 18-59 | 26.1 | 2.3 | 8.4 |
| MIR Full-Time Student | 49.6 | 4.3 | 17.9 |
| MIR 0 Paid Hours | 85.1 | 20.1 | 46.1 |
| MIR 1-909 Paid Hours | 64.3 | 4.1 | 34.2 |
| MIR 910+ Paid Hours | 19.4 | 0.8 | 4.1 |