Title I-A of the Elementary and Secondary Education Act (ESEA) authorizes the largest grant program in the ESEA, funded at $14.9 billion in FY2016. It is designed to provide supplementary educational and related services to low-achieving and other students attending pre-kindergarten through grade 12 schools with relatively high concentrations of students from low-income families. The U.S. Department of Education (ED) determines Title I-A grants to local educational agencies (LEAs) based on four separate funding formulas: Basic Grants, Concentration Grants, Targeted Grants, and Education Finance Incentive Grants (EFIG). After calculating grants, ED provides each state with information on the grants calculated for LEAs in it. The state then makes specific adjustments to the grant amounts, including reserving funds for administration and school improvement and determining grants for charter schools that are their own LEAs. After making adjustments to the grant amounts calculated by ED, the state then provides funds to the LEAs. The LEAs, in turn, distribute funds to schools, often based on the percentage of children in each school eligible for free or reduced-price lunch. The ESEA was comprehensively reauthorized by the Every Student Succeeds Act (ESSA; P.L. 114-95 ) on December 10, 2015. The ESSA made few changes to the Title I-A formulas. Changes to the Title I-A formulas under the ESSA will take effect beginning in FY2017. This report provides a general overview of the key components of each of the four formulas used to allocate Title I-A funds and changes to these factors made by the ESSA. Table 1 provides a summary of these components or "factors." Under Title I-A, funds are allocated to LEAs via state educational agencies (SEAs) using four different allocation formulas specified in statute: Basic Grants, Concentration Grants, Targeted Grants, and Education Finance Incentive Grants (EFIG). Annual appropriations bills specify portions of each year's Title I-A appropriation to be allocated to LEAs and states under each of these formulas. In FY2016, about 43% of Title I-A appropriations will be allocated through the Basic Grants formula, 9% through the Concentration Grants formula, and 24% through each of the Targeted Grants and EFIG formulas. Once funds reach LEAs, the amounts allocated under the four formulas are combined and used jointly. For each formula, a maximum grant is calculated by multiplying a "formula child count," consisting primarily of estimated numbers of school-age children in poor families, by an "expenditure factor" based on state average per pupil expenditures for public K-12 education. In some formulas, additional factors are multiplied by the formula child count and expenditure factor. These maximum grants are then reduced to equal the level of available appropriations for each formula, taking into account a variety of state and LEA minimum grant and "hold harmless" provisions. In general, LEAs must have a minimum number of formula children and/or a minimum formula child rate to be eligible to receive a grant under a specific Title I-A formula. Some LEAs may qualify for a grant under only one formula, while other LEAs may be eligible to receive grants under multiple formulas. As discussed previously, under Title I-A funds are allocated to LEAs via SEAs under four different formulas. Under the Basic, Concentration, and Targeted Grant formulas, funds are initially calculated at the LEA level, and state total grants are the total of allocations for LEAs in the state, adjusted to apply state minimum grant provisions. Under the EFIG formula, allocations are first calculated for each state overall, with state totals subsequently suballocated to LEAs using a different formula. That is, under EFIG a state grant amount is affected by the formula child count within the state relative to the formula child count in other states. Subsequently, LEAs within each state compete with each other for grants, and these grants are determined, in part, based on how an LEA's formula child count compares to that of other LEAs in the same state. Under the other three Title I-A formulas, grants are initially determined at the LEA level, so each LEA competes for funding against all other LEAs nationwide. Although the allocation formulas have several distinctive elements, the primary factors used in all four are a formula child count and an expenditure factor. The formula child population used to determine Title I-A grants for the 50 states, the District of Columbia, and Puerto Rico consists of children ages 5 to 17 (1) in poor families, according to estimates for LEAs from the Census Bureau's Small Area Income and Poverty Estimates (SAIPE) program; (2) in institutions for neglected or delinquent children or in foster homes; and (3) in families receiving Temporary Assistance for Needy Families (TANF) payments above the poverty income level for a family of four (hereinafter referred to as TANF children). Children in poor families account for about 97% of the total formula child count. Each element of the formula child count is updated annually. The formula child rate is the percentage of children ages 5 to 17 residing in a given LEA who are formula children. It is calculated by dividing the number of formula children in an LEA by the number of children ages 5 to 17 who reside in the LEA. The latter child count is determined based on SAIPE data. The expenditure factor for all four Title I-A formulas is equal to state average per pupil expenditure (APPE) for public K-12 education, subject to a minimum and a maximum percentage of the national average, further multiplied by 0.40. State APPE is subject to a minimum of 80% and a maximum of 120% of the national APPE for Basic, Concentration, and Targeted Grants. That is, if a state's APPE is less than 80% of the national APPE, the state's APPE is automatically raised to 80% of the national APPE. If a state's APPE is more than 120% of the national APPE, the state's APPE is automatically reduced to 120% of the national APPE. For EFIG, the minimum and maximum thresholds for state APPE relative to national APPE are 85% and 115%, respectively. After adjustments, should they be needed, a state's APPE is multiplied by 0.40 as specified in statute. Both the Targeted Grant and EFIG formulas include weighting schemes to increase aid to LEAs with the highest concentrations of formula children. In general, children counted in the formulas are assigned weights on the basis of (1) each LEA's formula child rate (commonly referred to as percentage weighting) and (2) each LEA's number of formula children (commonly referred to as number weighting). Under both percentage weighting and number weighting, a weighted formula child count is produced and the higher of the two weighted counts is used to determine LEA grant amounts. As a result, the higher an LEA's formula child count or formula child rate is, the higher its grants per child counted in the formula will be. All four formulas contain hold harmless provisions to prevent large decreases in LEA grant amounts from year to year, assuming appropriations are sufficient to provide hold harmless amounts. Assuming appropriations are sufficient, a Title I-A hold harmless amount is the minimum percentage of an LEA's prior-year grant that the LEA will receive in the current year. Under all four formulas, LEAs with a relatively high percentage of formula children receive a higher hold harmless level. More specifically, the hold harmless rate under each formula is 85% of the previous-year grant if the LEA's percentage of formula children is less than 15%, 90% if the LEA's percentage of formula children is at or above 15% and less than 30%, and 95% if the LEA's percentage of formula children is at or above 30%. In order to benefit from the hold harmless provisions under each formula, an LEA must meet the eligibility requirements for the specific formula. The exception to this requirement is that LEAs that met the eligibility requirements to receive a Concentration Grant but fail to meet the requirements in a subsequent year will continue to receive a grant based on the hold harmless provisions for four additional years. All four formulas have state minimum grant provisions. Minimum grant amounts for each formula are calculated in part or wholly based on a percentage of the level of appropriations provided to each formula. This percentage is higher under the Targeted Grant and EFIG formulas than it is under the Basic and Concentration Grant formulas. The EFIG formula includes two factors used to determine state level grants that are not included in any of the other three formulas—the effort factor and the equity factor. The effort factor for each state is based on APPE for public K-12 education compared to personal income per capita (PCI) for each state compared to the nation as a whole. In general, the effort factor benefits states that have a relatively high level of spending on education relative to their PCI in their state. Similar to the expenditure factor, the effort factor is also bounded but with more narrow bounds of 0.95 and 1.05. These relatively narrow bounds minimize the influence of the effort factor in the determination of state grants. The effort factor is the same for all LEAs in a given state. The equity factor for each state is determined based on variations in APPE among the LEAs in the state. The application of the equity factor results in higher grants to states with less variation in APPE among their LEAs and lower grants to states with greater variation in APPE among their LEAs. That is, the equity factor favors states with more equitable APPE among their LEAs. In addition to determining state grant amounts, the equity factor is also used in the determination of LEA weighted student counts.